Malicious PDF — malware analysis report

Static analysis result for SHA-256 81951aa9fcc414e5…

MALICIOUS

PDF

44.2 KB Created: 2020-08-24 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0017e82277ff08faf9a71c0edd64548 SHA-1: caa14db252d84435cb71b2b944a6e8e993975a41 SHA-256: 81951aa9fcc414e56f438f7fc12024cde9407a23ceaf281a80dcbb45bc26b04b
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for 'Netacad chapter 10 exam answers' which directs users to a malicious redirector URL. This redirector is part of a link farm designed to distribute malicious content, likely leading to phishing or malware. The document also requests recovery secrets, indicating a high-risk social engineering attempt.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=netacad+chapter+10+exam+answers+5.+0 In PDF document text
    • http://files.stampstation.com.au/uploads/1/3/1/6/131607404/6eebd.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/1/0432/8731/4585/files/veluxowoxulawulipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/wto_anti_dumping_agreement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8004/8037/files/62722193813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/algorithmic_trading_module.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/lunodoxupuxuwodivubim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/electric_guitar_sheet_music_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/binding_of_isaac_how_to_drop_trinkets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3689/3599/files/6725432351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/2448/2208/files/masemukatajuzifitera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/biographies_of_great_leaders.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/6853501521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/45848007215.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 1

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 5392 bytes
SHA-256: 646d372cb678329a395b1a62a5d290f2a39f8f475ab91eb15b9923f18c68cdd9
font_01_sfnt_off0000733b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733B 10032 bytes
SHA-256: 822970370a42f4b64c630c125cd591a9540b4dd9a3b8ca8b117c73aa20b89dec
font_02_sfnt_off00009588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9588 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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