Malicious PDF — malware analysis report

Static analysis result for SHA-256 725b54df28ad0aa3…

MALICIOUS

PDF

39.8 KB Created: 2020-08-09 23:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c532d260ed75447cf1012852c5469b15 SHA-1: 30e9a8538b8160fb68eec4549e18397b6cf9a950 SHA-256: 725b54df28ad0aa371b47e38714de645e31cc4e145121edf3b582b8f8bf16d2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely lead to phishing sites or malware downloads. No scripts were extracted, but the extensive link farm suggests a distribution or phishing campaign.

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=bead+loom+patterns+pdf
    • http://files.gromowskilawfirm.com/uploads/1/3/1/4/131408086/gepumide_kuvafimiki.pdf
    • http://files.nemescreative.com/uploads/1/3/1/8/131856392/zumonex.pdf
    • http://xuzok.nandisbirdpaintingsonwood.com/uploads/1/3/1/1/131164243/vuvixadinaxo_kosazuwufos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/2960/5024/files/contrato_de_arrendamiento_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/jajudulajegufomexup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3450/8455/files/stamp_on_the_ground_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/7058/4987/files/1144801206.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/newixigewejiviroxasuta.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/gitanuxumobojax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/zuponebuzuxasovogoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/69236386462.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/ritufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.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_off00005ecb.bin
bb022299683d07866bf447a91cc13236d120ba6c4b86ee0a38985152f31e1aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECB 5236 bytes
font_01_sfnt_off00007081.bin
045af9699bbf3d337d02310efc54656dbb4186fb665f338b2a1829eaf0bbff4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 10052 bytes