Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f218aa03d50d72e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 435459b0970392a8e511723de125d895 SHA-1: e96fcd328a21b62cbeda2eb2220caf16ef707c2c SHA-256: 7f218aa03d50d72eb157f48b11c664f521c105149e24ba62e337fdbcc578696e
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a user guide, likely intended to trick the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=excel+vlookup+user+guide+pdf
    • http://files.pitchandtossproductions.com/uploads/1/3/1/4/131453143/7732ca1337ec.pdf
    • http://files.stephenhardie.com/uploads/1/3/2/7/132712139/wafamiwapul.pdf
    • http://wunuki.cindylindgren.com/uploads/1/3/1/6/131637881/punowerapatufizonet.pdf
    • http://files.thebluelinedistrict.com/uploads/1/3/0/7/130739060/fijirejulup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/fegobajiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/45100604466.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/80450317935.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/demekefiluzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/powinitilufolijawerela.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/getanoxizokara.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/21125981707.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/gapup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/94015373115.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/ziruled.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/fosajuwawovuzemetilidu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/waxewukexezaketuli.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/49888566383.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d25.bin
1e942a5c14c8a4b05d5660f94aabda759696465af0843348ce3d37edde24e879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D25 5260 bytes
font_01_sfnt_off00007f2d.bin
a77c3392fd435e88bf26da03d8e4f4de982f5007fe391d105ac1b3574eda057e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2D 9964 bytes

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