Malicious PDF — malware analysis report

Static analysis result for SHA-256 8104b7c509faa334…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe908b7d97a44913a73f7c57e38f9b6 SHA-1: 947e2cbb45375443cb48300ee9057e47bb914403 SHA-256: 8104b7c509faa334c6735ea6bb5fca6268b07b9e03c159715dc5e31ac119963d
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious content. The primary malicious IOC is the redirector URL, which likely leads to further malicious activity.

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.ru/pify?keyword=geankoplis+4th+edition+pdf
    • http://files.shopthenoun.com/uploads/1/3/1/3/131381910/cbfb3.pdf
    • http://files.brownswoodnursery.com/uploads/1/3/0/7/130739375/bipakujifezo_mujelokifufor_xugumeg_xaburidexexu.pdf
    • http://files.jessicaleighwellbeing.com/uploads/1/3/1/4/131406275/a1368e4f6cf718.pdf
    • http://files.divimar.com/uploads/1/3/1/6/131606331/zawojimivugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/4083598414.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/75641013219.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6821/files/zawuzuzobemixugojim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/lumifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/dagagazubafopinasisosiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/90902475279.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/suzog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/99355491368.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/towegape.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/36423735841.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_off00006065.bin
928c0a03d3e8199329de9d324cade6481c0c2ae977c633408e98aaf931ea2cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 5004 bytes
font_01_sfnt_off00007172.bin
1cf384b56aeb895ed75fe69254e96881f288efc51a9c859c91ff08c5b2350a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 10296 bytes
font_02_sfnt_off00009492.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 4324 bytes

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