Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854deaaecdb6a11…

MALICIOUS

PDF

58.9 KB Created: 2020-08-30 13:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1827136707e477b7d09ee47bfa0f6cfd SHA-1: edf6797cead7a84346c08d24646c4290985b9bd5 SHA-256: e854deaaecdb6a11dde7776c4c0d2d35be699a191b19337bbd76f4ee12407249
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to known malicious infrastructure. The document body, though partially corrupted, contains the same URL found in the heuristic, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content.

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/wix?keyword=chargeur+pile+uniross+x-press+300
    • https://static.usrfiles.com/ugd/b8c837_e1e15348104e4cf1a43f89dd17fac07f.pdf
    • https://static.usrfiles.com/ugd/510a18_ef95ad37262849b589faa946e14791e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_41401a2f0eea43b1b83d15ee84866c36.pdf
    • https://static.usrfiles.com/ugd/aef5b7_da196d7ffc334505bb345b5ccd3329f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_729f1392a6704275a923f1451ad5518e.pdf
    • https://static.usrfiles.com/ugd/6cf392_b5051cda2a0749db90a2d92c240e0aee.pdf
    • https://static.usrfiles.com/ugd/98e298_ffd4fc7d9f18417da8b9b2cc3e608b8c.pdf
    • https://static.usrfiles.com/ugd/8cbfce_d5e4a5bf210445d18de95cabd7b2dcec.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/zugulujeguz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4432/9877/files/63607231405.pdf
    • https://cdn.shopify.com/s/files/1/0461/7633/8073/files/99569803128.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/business_administration_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0437/1234/8315/files/quantify_vs_qualify.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/bunavaxutugafi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/wefazoxorag.pdf
    • https://cdn.shopify.com/s/files/1/0437/8761/6413/files/adobe_illustrator_cs3_tutorials_for_beginners_free_download.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b3c.bin
13bac4f15194c751464ca0c49a7d404582d917f76141cf65fd884e6139a689b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3C 5392 bytes
font_01_sfnt_off00009d99.bin
1bb4c82d497c89d6827b9d5ddf8a0d4355f42474200e4c8b204d164ca5bdbe8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D99 13664 bytes
font_02_sfnt_off0000c866.bin
531951bd66d5f8e4efe9e2feeb5f5cbdc55e10bce4850f021009bf037ffeaa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 16556 bytes

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