Malicious PDF — malware analysis report

Static analysis result for SHA-256 1784cb2257132d40…

MALICIOUS

PDF

44.9 KB Created: 2020-07-28 11:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d272ce2448327e1cd72eac58814c4151 SHA-1: 47122234020922f6cd3dd3fc46955a1b5a4eb55e SHA-256: 1784cb2257132d40b2229a33e1721e9531411d8233f0a36b3a456094da6c43e0
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. The document body, though heavily obfuscated, suggests a lure related to 'Samsung frame tv installation guide'. The presence of numerous links and the redirector strongly indicate an attempt to distribute malicious content or phish for information.

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=samsung+frame+tv+installation+guide
    • http://files.envirolutionsconsulting.com/uploads/1/3/1/3/131379820/weriz.pdf
    • http://files.sauerkrautkitty.com/uploads/1/3/2/8/132814990/4b77a2ceae2b8a.pdf
    • http://files.ohscounseling.org/uploads/1/3/0/7/130776296/041efd1dd0e265.pdf
    • http://files.bctcpa.ca/uploads/1/3/0/7/130775980/nimugenuvigub.pdf
    • http://files.evernightdesigns.com/uploads/1/3/1/8/131857305/7353893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/68478061607.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/56182891762.pdf
    • https://cdn.shopify.com/s/files/1/0432/6647/4139/files/xosezagixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/15717824811.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/32646248474.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/pajofuka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/10067161004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/39731592104.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/50186516504.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/dijazoferun.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/rugomimemin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/17165842024.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_off00007152.bin
68c6da102fef1f3a550999520f5d10d588b5ad91b9d68258809c20643fee2f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 5272 bytes
font_01_sfnt_off00008321.bin
ad38151bd0d584075b1fc987868769e6f345e81f23a29eb8bfcf244015d46d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8321 10268 bytes

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