Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e630547d4cbf96…

MALICIOUS

PDF

36.5 KB Created: 2020-07-31 12:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75fa0fc49b5663357a9568b4f4105b98 SHA-1: 537df434cf6da9b8c413cbf26ae682cfafcd72e1 SHA-256: 18e630547d4cbf963508402c0ebd3af33ec8a6e5f2441920ee0ade8b2a38cedd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to an "Arduino tutorial pdf in tamil". The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.cc/pify?keyword=arduino+tutorial+pdf+in+tamil
    • http://files.justpeoplelikeus.com/uploads/1/3/1/4/131484133/salazokewus.pdf
    • http://files.mefielding.com/uploads/1/3/1/4/131406732/kixanigagebeda.pdf
    • http://files.tailwagmarketing.com/uploads/1/3/1/3/131398279/45cfe2926.pdf
    • http://files.kindercomics.org/uploads/1/3/2/7/132741144/9502228.pdf
    • http://files.wilmcommunityadvisorycouncil.org/uploads/1/3/1/3/131398093/592972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/bolarolatexol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/tomuvapik.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/90575904847.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/47265519628.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/rigarezajegunarazedej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72619586694.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6688/files/gedinilebejumejuwuxosive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/97287321533.pdf
    • https://cdn.shopify.com/s/files/1/0439/3838/1992/files/kaxidexikuxezotabikatub.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_off0000552f.bin
f5bf0b197c9a8af19ca1abcce64da40c85d278c363e5869031399fa686e18a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552F 4760 bytes
font_01_sfnt_off00006535.bin
a2bfd6932ddc3220a9bc9fef909917c5abd304707f936c6a5ab76b6637969900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 9292 bytes

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