Malicious PDF — malware analysis report

Static analysis result for SHA-256 0311b160fb537cf2…

MALICIOUS

PDF

60.3 KB Created: 2020-08-12 05:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8ddecbadfb50f8a549b6e97c15ba33 SHA-1: f7f0ba1b3ef174563513f1bf88da7951b6ee348f SHA-256: 0311b160fb537cf2310c1bb6e66ea12678f2a5c079d191a5e5ff6bfe64617067
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to the same URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. 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=brian+weiss+pdf+espa%25C3%25B1ol
    • http://files.businessrescuene.com/uploads/1/3/1/6/131606257/0ab23f66f0e0.pdf
    • http://liwum.nomadicbackpacker.com/uploads/1/3/1/3/131378950/5d2e8f13c7.pdf
    • http://gosima.aceadventuretravel.com/uploads/1/3/2/7/132712207/8f63ebbc82cfa.pdf
    • http://files.gonzaleschc.org/uploads/1/3/0/7/130739457/bitenum.pdf
    • http://files.trec.space/uploads/1/3/0/9/130969080/dumaterun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/pejumomomafaxopun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/24540836622.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/lagogijedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7741/files/kojivasako.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/6th_grade_science_textbook_california.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/jijonojepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/depulin.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3967/files/tomb_annihilation.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/jurusexe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/30_days_to_improve_your_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/gusafaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6867/files/change_discord_picture.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_off0000ac9c.bin
156b2f7bc0b2621edff81f89363666963c6e13d575b88f8a823e6d868b99f0ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9C 5388 bytes
font_01_sfnt_off0000bec7.bin
1b9400a811a61fd75134da9dfe3f80e3c5c28941348a9982abf6afde2dcb2764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 10456 bytes

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