Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8a016dc29edee5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-14 06:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f5dd8cc89a0287629599ef017ce56f SHA-1: bf4be5fb1fc273904456428d17e46f9b30ced25e SHA-256: 7c8a016dc29edee576f03bc0f7a5c577e24810560a176562d382baaf3589441a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, designed to obscure the ultimate destination. One critical heuristic indicates a direct link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to lure users into clicking malicious links. No scripts were extracted, and the PDF structure itself is the vector for the attack.

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=retail+assessment+test+questions+and+answers+pdf
    • http://files.rltfarms.com/uploads/1/3/1/1/131164383/c699b.pdf
    • http://files.inkandscribbles.co.uk/uploads/1/3/0/8/130813796/zidij_pinenejomegax_totex.pdf
    • http://duzag.lhschoolsupplies.com/uploads/1/3/1/4/131437987/ae88670829df.pdf
    • http://files.stockela.com/uploads/1/3/1/6/131636995/23795661d4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/52910947079.pdf
    • https://cdn.shopify.com/s/files/1/0446/6160/4505/files/wumuxazoleg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/busobagufejekonotarelune.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bumagigefabap.pdf
    • https://cdn.shopify.com/s/files/1/0437/4167/5685/files/8736417281.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/73437163407.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/zavedoxoxunigovoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/adobe_premiere_pro_cs4_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/spy_pen_camera_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/selarovofevojepaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/endnote_format_author_names.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b6.bin
34536e2d553031d5c7ef2fbd31835a2a6a16effc84e84cb3065643dde86cce82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 5412 bytes
font_01_sfnt_off00007811.bin
f50e456ff78917bbb9aff379f14e5ac7541410f835334615e06a40a07bc7160b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 10148 bytes

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