Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b527b2b67e4b27…

MALICIOUS

PDF

38.1 KB Created: 2020-08-06 13:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 084442f68f587b635ca266bd5cf295ff SHA-1: bfa5323a18d2cc52ca34fbffac28836d444706db SHA-256: a4b527b2b67e4b27ae13c8d9717a0a2782f0cbca9bd008ecdcc85476e7dea02b
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the URL 'https://ttraff.com/pify?keyword=storytelling+with+data+wiley+pdf+download' leads to known malicious infrastructure. The presence of a large number of external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to game search engines or distribute content through a link farm, ultimately leading to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=storytelling+with+data+wiley+pdf+download
    • http://files.800steps.com/uploads/1/3/1/4/131484395/nevorino-wusefuzi.pdf
    • http://files.wycombemcctrials.com/uploads/1/3/0/8/130814115/5425621.pdf
    • http://files.etotdelaware.net/uploads/1/3/1/8/131860787/89aa3.pdf
    • http://files.thehalloweenshopofbenton.com/uploads/1/3/1/3/131383283/2948959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/40832170298.pdf
    • https://cdn.shopify.com/s/files/1/0439/6885/6222/files/who_invented_beerpong.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/64792836425.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/bitezoraratuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/fifisifibozufikesawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/6356279738.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/what_does_brb_mean_sexually.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/pixejabimekuvovoxe.pdf
    • https://cdn.shopify.com/s/files/1/0447/8844/9437/files/arduino_starter_kit_manual_and_example_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/mepigexaduwoguzodod.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/29552229642.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005668.bin
0430be54b6649a6553c54ed542a32d91b0b6c773f6b33210b8280f8ce2313df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5668 5424 bytes
font_01_sfnt_off000068e8.bin
65f4facd08582e037fd33d50f1fadb719a3b4375f1d09ffda1e26db678449629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E8 10012 bytes

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