Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d528f42acfbdd02…

MALICIOUS

PDF

43.2 KB Created: 2020-08-21 11:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8c878c31afbe3ee229d39244536afcbd SHA-1: f1256b90d78ddb12f7f2412a98e22483018463cc SHA-256: 8d528f42acfbdd02110fcf030cdea88c7b5d27b9bf1009155619d1a79655b3b9
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Biology 12 textbook pdf', suggesting a lure to trick users into clicking the malicious link. The presence of a link farm further supports the malicious intent.

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/pify?keyword=biology+12+textbook+pdf In PDF document text
    • http://files.greensplendorlandscaping.com/uploads/1/3/0/9/130969938/b16fa747e3e.pdfIn PDF document text
    • http://files.byleyvillagehallcheshire.co.uk/uploads/1/3/1/4/131454317/vemudibudego.pdfIn PDF document text
    • http://boxid.majresearchgroup.com/uploads/1/3/1/0/131070112/6654259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/39945478740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/buyer_decision_making_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1177/1301/files/fundamental_accounting_principles_canadian_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2782/3765/files/29634566395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4257/8332/files/sepsis_and_septic_shock_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/melabikajogapufelapetiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/flash_games_on_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/99209724900.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACB 5332 bytes
SHA-256: e8ab321b30a4a47f7dd7cd16f7874a45820e4a26c0c5e12425fffeecc87f3810
font_01_sfnt_off00007d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D18 10364 bytes
SHA-256: 72edf58401263196fe8805cbf4d79d8c6b1b3ff344bcdb8eacba75706affd68a

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