Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca918fe73756d2d…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 21:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 08040514f6abcef3232f2037cec5349f SHA-1: 19d892c1f9a1fe623f8a4cc2dd698b95c8e6e7d6 SHA-256: dca918fe73756d2d12886302bb1b541a747ee8c0ac1960cf04a5493ec6c8864c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector, and presents itself as a tax form to entice users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a direct link to malicious infrastructure. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam context, likely aiming to trick the user into clicking the embedded links. No scripts were extracted, limiting the analysis to the document's structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.com/wb?keyword=form%201040%20taxable%20social%20security%20worksheet In PDF document text
    • http://files.cassandraroseclarke.com/uploads/1/3/1/6/131606756/534c70d020.pdfIn PDF document text
    • http://files.pdkmusic.com/uploads/1/3/1/3/131383541/jijodi.pdfIn PDF document text
    • http://files.themailoutpost.com/uploads/1/3/1/3/131379382/lojewixe-kuxokosesekax.pdfIn PDF document text
    • http://files.aliciaburdess.com/uploads/1/3/1/4/131408788/vagonudomuta-minupeb.pdfIn PDF document text
    • http://files.hongkongsprings.com/uploads/1/3/1/6/131636762/buten_bepelikuj.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/1/0435/6089/4627/files/dejakafolawajagixosarenam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/pifabaxopomum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/72724913737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/vowudirewupumiwabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/15577969935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/xerexiferi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/apache_poi_convert_excel_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/gaxofej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/47704349761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/bhagavad_gita_in_malayalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/jesig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/fidukopewijisude.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_off00006053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 5516 bytes
SHA-256: f61300315ad22d00ab0abaf004278839a0f6d39c9ef9cacb4d558da4666fd64f
font_01_sfnt_off0000733a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733A 10536 bytes
SHA-256: ccbfd3d521743fd540b23468ff49df30116cbc5fcabece8144178db23ed41f91
font_02_sfnt_off00009733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9733 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71