Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb2a298136ec754…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 06:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4df394fd5d9762ec41ff5e09a736cdce SHA-1: 9048336534d2fc75891af7b298cc917f05754921 SHA-256: 6bb2a298136ec7545d884077082fc35875ecd3c3068b685ec0412a50bea2c5b4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link redirects to a known malicious domain, likely intended to trick users into downloading malware. The document body text, though partially corrupted, contains the malicious URL and appears to be a lure for a free manual download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=bergey+s+manual+of+systematic+bacteriology+pdf+free+download
    • http://files.feehanlitmag.com/uploads/1/3/1/8/131856380/wumeza_sugogu.pdf
    • http://files.shirazgermanshepherds.com/uploads/1/3/0/9/130969659/pegipoxipefur_konitozividiv.pdf
    • http://files.saneegypt.com/uploads/1/3/1/3/131380547/7446064.pdf
    • http://files.forkedontherhode.com/uploads/1/3/1/4/131452735/xivepixegitor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/karthika_masam_pooja_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/comment_assembler_des_documents_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0429/4941/0979/files/59452893760.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/60084750101.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/git_set_upstream_branch.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/41034038598.pdf
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/23539059835.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/mukirogijamefuvosepoduj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/kiwuxazepupenasemer.pdf
    • https://cdn.shopify.com/s/files/1/0441/0913/6024/files/82938384970.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/epidemiologia_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/xajuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d7.bin
8963aa1a25697bdd078835f05aabf326f50b66bb9f06ed326c42bfac13dcdca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D7 5740 bytes
font_01_sfnt_off00007852.bin
29598118a7ff297b407360e58858c8eee7e72508d016039c478f90c68642b2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7852 10088 bytes
font_02_sfnt_off00009acd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACD 4324 bytes

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