Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eb4ce63b5d1710…

MALICIOUS

PDF

83.7 KB Created: 2020-08-23 12:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8bbd3e78586a80d6c3a3e3eeac553d6 SHA-1: 6f99d1fabea36834bd28180466ab3b52db0e9702 SHA-256: c4eb4ce63b5d17108cd44b8b09aebb51bcdb066bbba51eee76e1dbe98756947c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL that leads to a known malicious redirector, and numerous other links point to Shopify domains, likely part of a SEO-based link farm designed to obscure the final malicious destination. 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=chinnamasta+kali+photo
    • http://files.father-son-holy-spirit.com/uploads/1/3/1/6/131606901/af9ae0de619cc7.pdf
    • http://piserolu.samkaestner.com/uploads/1/3/1/4/131407558/9604320.pdf
    • http://files.brickwallcoach.com/uploads/1/3/1/8/131856949/1322816.pdf
    • http://wofipele.theexpatspeechie.com/uploads/1/3/1/3/131381241/rofisejeben-gogumefovot-zusuzuwolujenu-foromudovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007792176.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8357/files/aieea_ug_2019_hall_ticket.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/pesitojiwunadon.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/xusezedoborazuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5228/files/misivikorupot.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/gasozijexotelit.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/english_vocabulary_words_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/engine_damage_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/50596831528.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/rigufetonixibewado.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/25669117006.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/83991822165.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/gokam.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f084.bin
7910f83a01c140702ca34f8127b67ce468fdb598ae0c47385685701e40a6784b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 4932 bytes
font_01_sfnt_off00010118.bin
8050554bb3215bad4907ef24053aa334731eeb5f30e9d7e9450c4b659786dfdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 9940 bytes
font_02_sfnt_off00012367.bin
dab9fbe93c7f8db4ecee16d766d49dbc533f8ff1a533f29599a6ba1695387a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 9048 bytes

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