Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b521febfb11201…

MALICIOUS

PDF

63.9 KB Created: 2020-08-11 06:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344a64587cc3e36706e522aa8383dc39 SHA-1: 94e0fde139e0714a10c7f8d519a95a867eb085d8 SHA-256: a8b521febfb1120132ec9fc9f2218e2b074fa55177b1507c50198e1d3d23a2b3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDF files, many hosted on Shopify. The primary malicious URL identified is https://ttraff.ru/pify?keyword=buffer+solution+examples+pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains references to the malicious URL.

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=buffer+solution+examples+pdf
    • http://files.micheledewinton.com/uploads/1/3/2/7/132712206/1fe06c0547a8283.pdf
    • http://seviw.lancerdevault.com/uploads/1/3/1/4/131437657/marelamavukuv.pdf
    • http://dufoliped.airoparkourfreerun.com/uploads/1/3/2/3/132303382/votivowatos.pdf
    • http://files.nefahistory.com/uploads/1/3/1/4/131410952/xasanixokumimise.pdf
    • http://files.airconditioningcambridge.co.uk/uploads/1/3/2/6/132695679/gebonenelafabor-mabojix-kelujoxigoke-gipezonu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/customer_centric_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/33739241167.pdf
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/karoxarezarimomepokozud.pdf
    • https://cdn.shopify.com/s/files/1/0428/3868/7900/files/rojezawelixekogunoja.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/biomedical_waste_management_and_handling_rules_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/runokutinabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8243/2160/files/html2canvasmake_angularjs.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/sipuwumidalutirimuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9477/files/checkpoint_ccsa_r77_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/simosekugatobikemidomiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/diwujusopulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/migisaxafifimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/rrb_alp_answer_key_2020.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/
    • https://cdn.shopify.com/s/files/1

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a96.bin
10c62f6ca8e004da1047cfe55d0b5286f9e15e66bdf184d7f26c04ce8d91c0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A96 5304 bytes
font_01_sfnt_off0000ac94.bin
626cddb393c6f47bba1c1dc50565a3fab586d0608e92718c5822ca0bf949ce23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC94 15656 bytes
font_02_sfnt_off0000dce6.bin
7218744734f6461795c92999d79738413e64b3cf861b004d9428dd7ecbb9ceeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 16196 bytes

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