Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a10df536dd3c3…

MALICIOUS

PDF

46.5 KB Created: 2020-08-21 02:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2ffd9e6714ebcf4ad6ce41a8ea8bc9e SHA-1: c1844110937923cc1d174330a2bbc3e76f66319f SHA-256: db5a10df536dd3c3df546129b310b7aa4df88eb335cfaa1db0d920979d821eb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to a malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, includes the same lure text and URLs, suggesting an attempt to trick users into clicking the link. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, as flagged by PDF_SEO_LINK_FARM. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=kgf+chapter+1+movie+telugu+songs
    • http://xejunu.galitfriedlander.com/uploads/1/3/1/1/131164239/dfced0432f.pdf
    • http://files.ttallstar.org/uploads/1/3/0/7/130775361/diwawajebitiwarisi.pdf
    • http://files.jerseycarpets.com/uploads/1/3/1/4/131454373/zanijitubuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3653/files/wonuruvavug.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/sowokeluwijobutum.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/67902393066.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/tused.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/o_que__anemia_ferropriva.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/biomass_power_plant_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/contending_with_christianity_s_critics.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9633/files/varigojegowomuzakatej.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/accounting_concepts_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0449/2325/6999/files/mastering_the_market_cycle_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/lepokirodaw.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_off000060e9.bin
c8902d6dfabb8a2f6d5bc32576771d3fb2390ac7ff186f990c77e3772421cd0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 5392 bytes
font_01_sfnt_off00007334.bin
b5757943aa901dff5f8974a697d8c6883739181664f3709050011789f7cb1718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7334 14172 bytes
font_02_sfnt_off00009f6c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6C 4324 bytes

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