Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bb57a7cfc6e278…

MALICIOUS

PDF

50.3 KB Created: 2020-08-12 10:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 036939d289179c979f97c28e9c936788 SHA-1: 1484e727ff4b9a0aa70ace3b98cc93ec96888e9e SHA-256: 23bb57a7cfc6e2782a84907807acbce6d07987d29e6496aa07289ca156dc357f
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=calendario+lunar+octubre+2020+pdf'. Additionally, the document exhibits characteristics of a link farm, with numerous external PDF links, many hosted on cdn.shopify.com. The ML classifier also flagged this PDF with high confidence. The embedded document body text, though partially corrupted, contains the same URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=calendario+lunar+octubre+2020+pdf In PDF document text
    • http://files.bonviehomebuildersms.com/uploads/1/3/1/0/131070487/6794935.pdfIn PDF document text
    • http://files.circular-canary.com/uploads/1/3/2/8/132814387/123228.pdfIn PDF document text
    • http://files.integratedveterinarypathologybyalexandrabrower.com/uploads/1/3/0/7/130775734/ganeno.pdfIn PDF document text
    • http://files.azamericansaddlebredfoundation.org/uploads/1/3/1/4/131437865/c22849b7e4a4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/kozejenajifutilitinafuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/77513344106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/molufuriboz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/fazawede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/pegutisivoravuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/63223026687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/how_to_speak_american_english_like_a_native_speaker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/best_psychology_books_on_human_behavior_in_urdu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/custom_maid_3d_2_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/87287958585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/xawaradevemib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/76689627023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/9006149143.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 5288 bytes
SHA-256: 9cfa1ba0d644020152ad23ec7ad207f9db847602d940d57c80e67e13039bc862
font_01_sfnt_off00008951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8951 11120 bytes
SHA-256: d2f1b2b42f1216232c8eea5626ebba4c8794c6f037ba4f60f15613a215777c47
font_02_sfnt_off0000adbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361