Malicious PDF — malware analysis report

Static analysis result for SHA-256 05851f81ab810149…

MALICIOUS

PDF

44.8 KB Created: 2020-08-15 05:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95056c51455e6602fe07db93d8db9811 SHA-1: 8d963c177d3442d3ec0b5ea57dd948a52b123a54 SHA-256: 05851f81ab810149323f41d5cb3c4decbfb4c86611260b7904a582a9c6c537d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for the game Borderlands 2, aiming to trick users into clicking the malicious link. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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=borderlands+2+solo+class+guide
    • http://files.pruewalkerfasd.com/uploads/1/3/1/4/131437953/deboxepij.pdf
    • http://files.juicespancakelounge.com/uploads/1/3/2/6/132681749/f93946660b663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/kikowapudafapuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/27637037228.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/13784607846.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5276/files/being_a_godly_wife.pdf
    • https://cdn.shopify.com/s/files/1/0435/3264/8602/files/facebook_page_category.pdf
    • https://cdn.shopify.com/s/files/1/0437/9167/9648/files/pocatello_weather_radar.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/muvurifemaxadupove.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/english_language_course_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/miwaza.pdf
    • https://cdn.shopify.com/s/files/1/0447/9900/0737/files/community_psychology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/pusuzeforegisuvebonazuwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6966/8517/files/merof.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_off00006269.bin
42caf10601e6ec45b6ae6d1deb850f7d17a294e83c780ee2aa26ebf8b16147fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6269 5092 bytes
font_01_sfnt_off000073bb.bin
338641b781a318ec54eb6bb1d43167246e139e9a761611b0712f5093f64271c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10672 bytes
font_02_sfnt_off00009844.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9844 4324 bytes

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