Malicious PDF — malware analysis report

Static analysis result for SHA-256 6906b0c459d5c3ed…

MALICIOUS

PDF

55.3 KB Created: 2020-08-04 19:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd41470b40f18bafeff3e476e5ee6535 SHA-1: 77ab0316c0856ab790e92b3f2924a66ad481fd22 SHA-256: 6906b0c459d5c3ed5a8b7327f6e38b0e32e2b6f2f7c9258bd8fd054394e00175
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a GRE practice PDF, which redirects to a malicious URL identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=official+gre+verbal+reasoning+practice+questions+pdf+download
    • http://files.roysecityhomeschoolacademy.org/uploads/1/3/0/9/130969154/gipusa.pdf
    • http://files.elizabethtownchristianacademy.org/uploads/1/3/0/9/130969663/ronamiruf.pdf
    • http://files.hausofv.com/uploads/1/3/0/8/130874501/fewimopejawa.pdf
    • http://files.chesygn.co.uk/uploads/1/3/2/8/132815791/pubimem.pdf
    • http://files.pancreaticalliance.org/uploads/1/3/1/4/131437064/jesewasavugapege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/dogazufevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/9575676750.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/vanokuwovowerigulig.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6665/files/minecraft_hide_and_seek_servers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/depefuful.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xanixiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/e5_a4_9a_e7_91_99.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/14921892824.pdf
    • https://cdn.shopify.com/s/files/1/0438/0763/7661/files/29028401879.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/66509726384.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/75842221742.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_off000087d9.bin
29396402769d30008e95d6bbd4a732328c0ba77056ed3dc344de19e5e992e777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D9 5652 bytes
font_01_sfnt_off00009b1f.bin
9897156e19e3c7e0c5f44f0ff302083c44b154fe194ba786d68d59b273e38103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1F 11284 bytes
font_02_sfnt_off0000c110.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 4324 bytes

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