Malicious PDF — malware analysis report

Static analysis result for SHA-256 f938b378123c899c…

MALICIOUS

PDF

43.6 KB Created: 2020-10-27 05:24:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 804991d6a9b4c573a7d4b8e614d96ad6 SHA-1: 388dd4ef4cb0f18f043a89b9573ac9a9fbd0664f SHA-256: f938b378123c899c3a445396cc27f3c2e01881f19025257d57c015de98f7a317
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links, https://ttraff.ru/123?keyword=cost+of+living+in+dubai, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the extensive link farm and malicious redirector indicate a phishing or content-luring attack.

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/123?keyword=cost+of+living+in+dubai In PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/weside.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/dfe2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f92ecff97086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f9230d5b30f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6bfe4b7-00f3-4922-ba71-f61a1d510ba4/native_american_symbols_and_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b31f287-e35a-4f64-aa6d-2a1430f45232/6251628818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589403e3-ba7d-4a78-98ac-4c9198f175b4/muxifupanukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e9f1f1-7ec1-4d46-9661-7ed25b65acdb/rozixigezuwanixat.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/minukeporonilajim.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/10203782901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51f0ea8-e06c-4f39-b46e-800fe4a7b532/growing_tomatoes_in_florida_panhandle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c301f8-badb-4f3a-b98f-eb5ab91653db/bupidivajemokima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31380a7-6df7-44c4-82ab-28108bdcf9bc/93186395021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3607/7980/files/fasedotaxusof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0876/4321/files/coraje_el_perro_cobarde_abuelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3210/7937/files/zikivumupide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8404/7023/files/negative_reinforcement_vs_punishment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5516/7668/files/ragnarok_m_eternal_job_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC7 5084 bytes
SHA-256: 2f7346c7122b0b8544b843df36ed83f374e67e2a704610e1943a9f58182aaf79
font_01_sfnt_off00007c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2B 10988 bytes
SHA-256: f78bc2bbd4679ed87d9d2c407a93801855d199fdc79dfe883cab79664ecde4b4

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