Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a912d2896afca12…

MALICIOUS

PDF

33.9 KB Created: 2020-08-31 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab7f0db326658e10dcd09cd31820d34d SHA-1: 1f2c6b832503d3c487f0b40684b89c6a60b97d7c SHA-256: 0a912d2896afca12037bf17d40603673b47d8eace3bb145519b62feb58ae9054
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a search result for educational content, which redirects to a known malicious infrastructure. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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/wix?keyword=great+gatsby+socratic+seminar+questi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/pupujoperefovogarumixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/82279563773.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/nozegixaduderegapiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/54466799265.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/suzovulugumumenof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/17664059626.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9238/files/werop.pdf
    • https://static.usrfiles.com/ugd/b8c837_a48aadfae073462e9cb75e0e7d8bd031.pdf
    • https://static.usrfiles.com/ugd/55f640_2484645db4654208936bafbf24abbfd4.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/12472064576.pdf
    • https://cdn.shopify.com/s/files/1/0435/8543/7853/files/vodeze.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_off0000473c.bin
a98280b84bafe6ca54286396d50e4a24ba8a0841fa5a0e234fd7da21582d1fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x473C 5484 bytes
font_01_sfnt_off000059d7.bin
83252768277ecb71e26093297991e79c91fecb5deb78ed93e749ca4561f23531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D7 9532 bytes

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