Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1163da21ac8160…

MALICIOUS

PDF

55.3 KB Created: 2020-08-12 18:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01aa729195af53998d0491b981e392be SHA-1: aef24df25b904778e448021096240dabcfce04a3 SHA-256: 6b1163da21ac8160427a0f532414202f085c7609d562b49ff703cdb0c2dbe899
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to the lure and the redirector URL, suggesting an attempt to disguise malicious content as legitimate information and lead the user to a harmful site.

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/wb?keyword=sistema%20reproductor%20masculino%20pdf%20anatomia
    • http://tomixuler.bsbakery.net/uploads/1/3/0/7/130739783/lozinut-lakufapolitu-litevi.pdf
    • http://files.rachelhammermanart.com/uploads/1/3/1/3/131379596/zamutajonisudezap.pdf
    • http://files.pdcreccenter.com/uploads/1/3/2/8/132815767/jimepewulukag.pdf
    • http://files.thomtondesign.com/uploads/1/3/0/7/130775245/2cc084f6.pdf
    • http://files.efjja.com/uploads/1/3/1/4/131408024/kasoras.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/nadirozamoxodinoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4220/files/davepijirudobepasiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3866/8965/files/canon_5d_mark_iii_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/58631955537.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/71662802925.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/senior_electrical_engineer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2727/files/76782262617.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/55160723348.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/rizorumumekumof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5208/9000/files/87881970559.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/33699123677.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/bright_line_eating_14_day_challenge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/libro_cerebrito.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_off0000895a.bin
a9fe33fdd9b11af047ad8e567cfc74a153a40d1ed2d3c32c46cf2caa51c0b770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895A 5288 bytes
font_01_sfnt_off00009b26.bin
cf4fef2d3e9b294977ae4ec911bda0ef68c0196c637c8cf0b8961ca174644d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B26 11164 bytes
font_02_sfnt_off0000bf93.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF93 4324 bytes

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