Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77f02aff9dc2e6a…

MALICIOUS

PDF

32.8 KB Created: 2020-06-04 19:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d092d98e31753d5f82c138207a77b8 SHA-1: 8ef10cfa204fe3a9b266a52754831c87eac7b38d SHA-256: a77f02aff9dc2e6a2de1a0b5d037434ca83c3531d26b097fc24e98b5172b4486
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs on different domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of SEO-optimized PDF files hosted on various domains, likely as a lure or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://lovedanceyogarelax.com/uploads/1/3/0/4/130436165/130436165.html#the+avr+microcontroller+and+embedded
    • http://kristianhricdesign.com/uploads/1/3/1/1/131164021/xikepinasibarewes.pdf
    • http://1stavenuecoins.com/uploads/1/3/0/6/130620695/5602030.pdf
    • http://arrowcredit-disclosure.com/uploads/1/3/0/2/130289686/xuwigapijimimumitej.pdf
    • http://evakyndt.com/uploads/1/3/1/3/131384696/lotupejinizasi-nuvipapolu-fokepoxojonevem-doropowu.pdf
    • http://rvbuyersnearme.com/uploads/1/3/1/4/131437352/ruxelusinexite-degovar-dapavukasufuba.pdf
    • http://mta-sts.mail.schoolofrespect.com/uploads/1/3/0/3/130323115/xokuramugutezaten.pdf
    • http://149.undesirable.us/uploads/1/3/0/7/130740324/piveje_nilalexelubule_xunesesaposuf_nekorobobi.pdf
    • http://spartanracenjlodging.com/uploads/1/3/0/5/130539428/07bd726139.pdf
    • http://brodeurhort.com/uploads/1/3/1/3/131384735/tifop_nimevufadubu_robajili.pdf
    • http://lovedanceyogarelax.com/uploads/1/3/0/4/130436165/terms.html
    • http://lovedanceyogarelax.com/uploads/1/3/0/4/130436165/dmca.html
    • http://lovedanceyogarelax.com/uploads/1/3/0/4/130436165/policy.html
    • https://pixafir.files.wordpress.com/2020/06/faxej.pdf
    • https://bapalejuna868855280.files.wordpress.com/2020/06/54047402644.pdf
    • https://derejawina.files.wordpress.com/2020/06/8652893518.pdf
    • https://jumuxek227837891.files.wordpress.com/2020/06/guwetedajezu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057e7.bin
7fe009e31ac9ec97f552111007e4a8124144ee8da7181293477e80bb4ec197d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E7 9356 bytes

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