Malicious PDF — malware analysis report

Static analysis result for SHA-256 895f6ca1b3711607…

MALICIOUS

PDF

52.2 KB Created: 2020-07-31 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04a0917b7649c71f89a1ddd92e65b1aa SHA-1: 37936705ce34c97ceb10658a8fff2d96083e45c6 SHA-256: 895f6ca1b3711607009be77dac86bad1a27409297439d3c7a659052de12e80ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Adobe illustrator training pdf'. The presence of numerous external PDF links, many hosted on Shopify, further supports a link farm or phishing attempt.

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=adobe+illustrator+training+pdf
    • http://files.colemansei.com/uploads/1/3/2/3/132303092/c575fd99d2d.pdf
    • http://files.laposteperry.com/uploads/1/3/0/7/130776401/69ddb.pdf
    • http://files.rebeccadentonphd.com/uploads/1/3/1/6/131606134/tigiw-fanaf-zerelodevunu-wofititewarolul.pdf
    • http://files.giniasgems.com/uploads/1/3/0/7/130775350/bikamup-zazitom-gupope-wuviwaged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/7573/7502/files/1194788180.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/79571378288.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/60386361174.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/vemuvetefarato.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/dutekofozejizusesej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8244/0103/files/66055968588.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/44492360419.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/kezipifutum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/84583885990.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/27437325003.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/14741875998.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086f1.bin
b1a4f713b5c963c4ca0a9da17f74b9418ec445fd5a2875e0f8bf6c6e5b15aba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 5220 bytes
font_01_sfnt_off000098ad.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98AD 1800 bytes
font_02_sfnt_off0000a13a.bin
d71521bc86760f686357fc59381ac4ff774e2cb9f116fc9cfc128eaee353767c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13A 9924 bytes

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