Malicious PDF — malware analysis report

Static analysis result for SHA-256 624df2c67e3d3f0d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 16:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df7fcabd3b4d728705323f1011d0e11 SHA-1: 1c831545055bfb76b6e5e4245d00747a8004af76 SHA-256: 624df2c67e3d3f0dea17610d1592d365040e3d51b78942002443070bb642ca31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that align with the heuristic findings of a malicious redirector and a link farm. This suggests the document's primary purpose is to lure users to malicious sites, likely for further exploitation or phishing.

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.ru/pify?keyword=amendments+11+27+pdf
    • http://files.agrseedandsupply.com/uploads/1/3/1/3/131383493/pogos_womapop.pdf
    • http://pujef.beadedbraceletsgalore.com/uploads/1/3/1/8/131856703/4357611.pdf
    • http://files.amorhealingkitchen.org/uploads/1/3/1/8/131871734/dilozapiwokinos-sorilajet-melalipomade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/98284559515.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/56184410592.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/84964458889.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/digestion_de_las_proteinas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7943/files/42134117041.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/dolokeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/sumilixetupa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/gamixojuvuxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/45710420992.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/70247727907.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/biwosuzazibuvawumup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/4443787879.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/62022957855.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_off00006731.bin
79e51d673787c7d66b81dcd15463ef3ff401cbee6d3df52e85c031af136b643a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 5104 bytes
font_01_sfnt_off00007896.bin
51c65662bca14a345aa6aa62e93a54c328a365931e896607a9a4a735731151b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7896 10004 bytes

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