Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2dbb9a0bf0629d…

MALICIOUS

PDF

44.4 KB Created: 2020-07-30 09:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231cb0774a1c436fe66faef60f030d25 SHA-1: 53dd879da01bcb2864a2927f9c3593dc41d2712c SHA-256: 6b2dbb9a0bf0629d228a369b37fbc813b09c9ba410f225dbee485c0d66926b31
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly as part of a link farm or SEO manipulation scheme.

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=histologi+arteri+dan+vena+pdf
    • http://files.roundmountaincreamery.com/uploads/1/3/0/8/130874613/9f2e97cf8e07.pdf
    • http://files.nurseguy.com/uploads/1/3/2/7/132710763/cd18b8e.pdf
    • http://files.nanolab.info/uploads/1/3/1/3/131379749/befuraxigufero.pdf
    • http://files.gracejiang.info/uploads/1/3/1/8/131856627/4945528.pdf
    • http://files.hotcac.org/uploads/1/3/1/8/131857631/votuwi-jafebapo-belojaloxuduge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/basenepawibarazaxifop.pdf
    • https://cdn.shopify.com/s/files/1/0436/8397/1237/files/56819007907.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/fafawusisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/tepebijivab.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/3438362723.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/78818674005.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/wufopeguxesox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/fisasijofevejozoxorafeke.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_off00007108.bin
c9b91272a2805d947a1d6c612d8bde53ba343e8cc6a2781d45284ffd04982e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7108 5016 bytes
font_01_sfnt_off0000821f.bin
e50af2f39b411bf957295b7d977cc567ad9c988ec168aa4918eb1647394474bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x821F 9996 bytes