Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcabd5a41cd68f6…

MALICIOUS

PDF

54.6 KB Created: 2020-08-14 05:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa56fc1cc242115af799cbc9adae8786 SHA-1: 3e296f894cbe8a9c966ca123247c719a4412c0f5 SHA-256: 6bcabd5a41cd68f6d9f6bce00cac8458f4fd7c8c9c384e78f96033fc85702542
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=steam+boiler+technology+pdf, which is likely used to distribute further malicious content.

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=steam+boiler+technology+pdf
    • http://files.annaephoto.com/uploads/1/3/0/7/130775145/9688182.pdf
    • http://nufiboler.yesgift.net/uploads/1/3/0/8/130814328/8828685.pdf
    • http://files.kopou.org/uploads/1/3/1/3/131381288/nidaza_timagajeti_xemaxufu_serikoje.pdf
    • http://xanan.bozemantriathlon.com/uploads/1/3/1/4/131407406/genewebafeg.pdf
    • http://files.lodgestmodan985.com/uploads/1/3/1/4/131455463/jatokabog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/79532286970.pdf
    • https://cdn.shopify.com/s/files/1/0450/0963/3444/files/49519635426.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/51815150497.pdf
    • https://cdn.shopify.com/s/files/1/0434/0350/9911/files/loan_application_letter.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/bukiwul.pdf
    • https://cdn.shopify.com/s/files/1/0446/8667/2025/files/answering_the_phone_in_korean.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/labirisefewekiwolixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5161/4359/files/99073547977.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/makag.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/79179281270.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/sazotasogokexejiguvov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/timaserofo.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_off000097aa.bin
f41eadd585007e0b5ceb2fe543b6e83dc3ac147c7269ef214507933b1ef775eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 5736 bytes
font_01_sfnt_off0000ab0c.bin
180810393a93bf9f1a78ba857d669ebbee41825e35be0fc7616706c4a37f568a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0C 10032 bytes

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