Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb68b62d5835129…

MALICIOUS

PDF

38.7 KB Created: 2020-09-18 03:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb7872d74eb8e1ba848613567fab7ac SHA-1: e345e43b5e5ec309500ec12e3902d179823cdc98 SHA-256: 0cb68b62d5835129fbfb001eeacf1138666f8421ff69ebf6322daa3684082552
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.club'. It also exhibits a PDF link farm pattern, embedding numerous external PDF links, many hosted on Shopify. While the document body is heavily obfuscated, the presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users. The embedded URLs suggest an attempt to leverage SEO poisoning or distribute further malicious content.

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.club/wix?keyword=d%2526d+gem+dragon+god
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/12485321755.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/buell_1125cr_performance_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/can_apple_facetime_android.pdf
    • https://cdn.shopify.com/s/files/1/0465/1519/1958/files/kivufig.pdf
    • https://fb0d35fe-6c4c-442a-a6b7-73e57a0569e7.filesusr.com/ugd/3cb679_fe3911db351e44d0b2b7e3aeee2fd867.pdf?index=true
    • https://91c62c8a-4c3b-45ab-ae93-79ac20e4171a.filesusr.com/ugd/6dcf04_525e1d585b274309af3c8bc2208a194b.pdf?index=true
    • https://bf956f8b-10ea-4907-b2ad-4d13cc07094f.filesusr.com/ugd/3c9ac1_f30964970c0f464f8a4a12d80e596376.pdf?index=true
    • https://466b2f42-27fc-432a-b1c6-97b1c3e719e2.filesusr.com/ugd/e7e4a0_9afec2f44dd8440bb0a85b39df92a818.pdf?index=true
    • https://b173bc81-52f7-441e-9989-d55bd8fef0ba.filesusr.com/ugd/120f26_5ffdfaf906a44376aa307e1c817a8e0f.pdf?index=true
    • https://29151560-017a-421b-b7f9-c0242ffeba42.filesusr.com/ugd/daca0d_9d079835b0584ebcb7c45120bbfde3c7.pdf?index=true
    • https://62252d99-ff10-4b64-9c3c-24063e363cd8.filesusr.com/ugd/89363e_5bb6c37f82bb42e89431dee110190676.pdf?index=true
    • https://12b2a624-8c34-433b-a5aa-cccbb27ff598.filesusr.com/ugd/ccf397_dd56e59b03b847b3ad58b6d595babfb7.pdf?index=true
    • https://7bb596cc-f3aa-44cf-a4f5-8c0c48b34bde.filesusr.com/ugd/c4ccc4_306a694fc378489d878057c96f6d9075.pdf?index=true
    • https://cf31d984-957a-48bd-94e3-579f19cc444c.filesusr.com/ugd/5ecadc_422e0aed6bf34624a90a1b60e1e8ef6a.pdf?index=true
    • https://bca10585-7104-4112-8589-8be018e97bdc.filesusr.com/ugd/4cd51e_69241ba65ea9473dbc3c4a2c39c2f273.pdf?index=true
    • https://90130866-3ea1-47ad-b82a-15989bdcec24.filesusr.com/ugd/cafc24_90bd09ad6eac4356a496dc47be454cfe.pdf?index=true
    • 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_off00005e89.bin
5bcf7f318894cd8667f709bf970fa8c582a8027402ea75fdf14ac0e15260a4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 4156 bytes
font_01_sfnt_off00006cb6.bin
9fc90b70f5dda6b61625ec46dd5f12317f2021b78dc56b16e7d2d9811960545e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB6 9952 bytes

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