Malicious PDF — malware analysis report

Static analysis result for SHA-256 539b7356f9ee4db1…

MALICIOUS

PDF

53.3 KB Created: 2020-08-10 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3168b8c6e9761d9398360a6285c96038 SHA-1: 5448502106346825999042fea9db530a39c550fd SHA-256: 539b7356f9ee4db1d0895a78ffa1abb2a8014c9ef9be6af6b205b5382542e0a0
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or redirection tactic 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.ru/pify?keyword=articulos+sobre+alimentos+transgenicos+pdf
    • http://files.rockdogltd.com/uploads/1/3/1/3/131383247/2272993.pdf
    • http://files.livingoutofthisworld.com/uploads/1/3/1/4/131453188/mosexolo.pdf
    • http://files.triciabutskiart.com/uploads/1/3/1/4/131455475/19d106098e0ef.pdf
    • http://mugir.kassandraheap.com/uploads/1/3/1/4/131407406/205aef4b28.pdf
    • http://files.snicholasuoc.org/uploads/1/3/1/8/131856815/nijedazapofib_suwugixodob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/reality_therapy_journal.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/18748946827.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/33676929603.pdf
    • https://cdn.shopify.com/s/files/1/0440/6388/3429/files/9612425269.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/fewaxodewifivud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/53278965646.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/rabiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/87566686049.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/snake_game_cool_math.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/59919341194.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/nejireguxasepasepodulu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/3021139077.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_off00007ff5.bin
3bedcac6cb32ce1f345f99eda3a378134444454b71fce2666073b44133047478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF5 5488 bytes
font_01_sfnt_off00009277.bin
7128e19ef9f16b394f612fc5a889b7cc412367d8b457841b33b1fff156a066d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9277 11484 bytes
font_02_sfnt_off0000b7d3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 4324 bytes

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