Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a95145cf9e4757…

MALICIOUS

PDF

40.7 KB Created: 2020-10-27 17:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554348bd2d3b159c38b80ac3bc85630f SHA-1: 53cfc4dbdf174af9b270f60e29005c853f426d95 SHA-256: 84a95145cf9e47570e02bd9dca4bd2c8355cf88a27694a32d29037dae3313e2f
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 external PDF files, indicating a link farm designed to manipulate search engine rankings or lure users. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

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://gettraff.ru/123?keyword=bubbles+and+blocks+prices
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f870dfb3410f.pdf
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f90103fc4a94.pdf
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f8a52f5ef29b.pdf
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f968caacbddc.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f91c7dfaac30.pdf
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f8a87c74365a.pdf
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8caac064e33.pdf
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5f8e855c7fd26.pdf
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f885917ebf5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/lonolo.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/bam_aerobic_plate_count.pdf
    • https://s3.amazonaws.com/fovezewi/75456712831.pdf
    • https://s3.amazonaws.com/memul/22613695168.pdf
    • https://s3.amazonaws.com/tetazino/49052862183.pdf
    • https://s3.amazonaws.com/zetare/45909031561.pdf
    • https://s3.amazonaws.com/mefadedosuw/69462782943.pdf
    • https://s3.amazonaws.com/rokuwapesu/87226099144.pdf
    • https://s3.amazonaws.com/wilugugo/zotememodapaw.pdf
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/russia_revealed_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/xixizunozapexiletuji.pdf
    • https://cdn.shopify.com/s/files/1/0480/4372/0868/files/bad_time_simulator_sans_fight_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/vellamo_apk_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/keguzifoboteriwu.pdf
    • https://cdn.shopify.com/s/files/1/0483/5642/5879/files/liber_abaci_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0500/6101/7283/files/stavudine_mechanism_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0438/2425/1042/files/96232199109.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_off00005e8e.bin
e3d38296cb0dbec2361f04b376b24784f7f61f6377eb03f4804fadc78e1364fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8E 5320 bytes
font_01_sfnt_off000070a6.bin
8d0f2ead2f875f193afbeee166ad91f7facbc57c3965319046f9ea177e2ba04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 10768 bytes

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