Malicious PDF — malware analysis report

Static analysis result for SHA-256 02545da4d1948fd3…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 00:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fe8f3802d005f091cc28e15c3f21ab3 SHA-1: f4c9d086ee46fe78835e800c98319415ad7ed89c SHA-256: 02545da4d1948fd39b9585d5a779187a6e6e81817f7164e583c703e95540ba80
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body also contains this URL, presented as a link related to 'biology 101 laboratory manual answers', suggesting a lure. Additionally, the PDF was flagged by an ML classifier as malicious and contains a large number of external links, indicating a potential link farm or SEO manipulation tactic.

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=biology+101+laboratory+manual+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/f84671_d290351baa2c43b4857dca48ccfc8296.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ebabf572332487ba4a4f7712ca3cfcc.pdf
    • https://static.usrfiles.com/ugd/162fe6_297b9312a5b84fe3a2c9f684815ef86a.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/4197887659.pdf
    • https://cdn.shopify.com/s/files/1/0438/1091/4466/files/resume_and_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/20617210231.pdf
    • https://cdn.shopify.com/s/files/1/0428/7745/2454/files/anomaly_detection_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0450/3139/1396/files/karupen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1296/files/accra_high_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/lonifateta.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/barabbas_novel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9095/files/chocolate_day_special_images.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/aaradhike_song_wapmallu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6089/5650/files/bibireboro.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_off000049eb.bin
8c1ec6b1326075b2e29000dcfc633ad0672add75f95ea0e2091bd3d8bcdd91b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EB 5464 bytes
font_01_sfnt_off00005c74.bin
cb20ebe918b5fc8026fbe93f346b61e3cca7ba759d08a5bf89e63372af69928a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C74 10116 bytes
font_02_sfnt_off00007ef0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 4324 bytes

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