Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87feec312c30823…

MALICIOUS

PDF

40.7 KB Created: 2020-08-07 06:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d045b618a8f94932cdf0a338e11a14 SHA-1: b87c4866f4c8fc34d7895356d90dd34c7c373f97 SHA-256: b87feec312c308235571321f5df1d0e7727d7163817f6b38caa45a56636a6c30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=weber+carburetor+manual+pdf+download'. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to lure victims. The primary attack pattern involves redirecting users to malicious sites.

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=weber+carburetor+manual+pdf+download
    • http://files.noellegracephotos.com/uploads/1/3/1/4/131453894/liludatogodunipesa.pdf
    • http://files.concealedwindowtinting.com/uploads/1/3/1/1/131164156/2744266.pdf
    • http://files.chiefsthreads.com/uploads/1/3/1/6/131637546/fc0d572.pdf
    • http://files.bonflavourtea.com/uploads/1/3/1/3/131398246/jadorobiwu.pdf
    • http://xinubejir.ashlypianocrafts.com/uploads/1/3/1/3/131381428/3e83f7955.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/femepotufitaxaturu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3311/5289/files/lakewajewanavexoxob.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/78012776353.pdf
    • https://cdn.shopify.com/s/files/1/0437/2597/9813/files/41637726596.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3752/files/deutz_f3l1011f_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/wavavaduda.pdf
    • https://cdn.shopify.com/s/files/1/0428/8485/8022/files/uefa_champions_league_2020_fixtures.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/vuwuporetigozavuxivumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/93114587625.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/boravevuwovupovekipago.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/army_da_form_31_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/embryonic_and_fetal_development.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000600a.bin
3c10e3ada6d713a8093e014b64e076b0563fbb934bde5b2e4e4c6305f2692975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 5368 bytes
font_01_sfnt_off0000724a.bin
7a8fe40a7fac4dcfd22068ce4fd6c84abdb99770466e5f85b8a50850523c526f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724A 10428 bytes

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