Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c5396059f0e3e6…

MALICIOUS

PDF

46.2 KB Created: 2020-08-19 14:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1311281ec500ed14566e4c801c1325c2 SHA-1: 604346c7039754883b33a7fb8e1a772e0e1d01e8 SHA-256: 99c5396059f0e3e698454f2b6b33275c120c9dbb59e81603f191ad6e44fc5c96
194 Risk Score

Malware Insights

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

The PDF contains a prominent link with the text 'Chegg answer bypass', directly leading to a redirector URL. This indicates a phishing or scam attempt, likely to harvest credentials or deliver further malware. The ML classifier strongly supports the malicious nature of this PDF. The presence of numerous other PDF links suggests a link farm for SEO manipulation or distributing malicious content.

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.cc/pify?keyword=chegg+answer+bypass In PDF document text
    • http://lexejavup.grumpytg.com/uploads/1/3/1/6/131606260/6129379.pdfIn PDF document text
    • http://files.yellowbirdnestweddin.com/uploads/1/3/0/8/130813988/938556.pdfIn PDF document text
    • http://files.thomasfc.com/uploads/1/3/0/7/130738719/677013.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/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/wupaxaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/23438796491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/nekegutujaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/61999852313.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/36896776516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/52713901966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/reverse_polish_notation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/dakudilubakugumawexewax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/rofokasakawikudiwil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/14850917690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/abbyy_transformer_plus.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 4

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_off00006b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 4956 bytes
SHA-256: 77d594d10a863eb4d57020b3c9a931a232fc6fcd3725f4e148dd2f84c85d6057
font_01_sfnt_off00007bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 10048 bytes
SHA-256: 145832bd6185fd2f88d55a05c4b7c55bfa4c1fdecf7d040b8ad39d62390b7144
font_02_sfnt_off00009e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E01 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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