Malicious PDF — malware analysis report

Static analysis result for SHA-256 027bfb8e659c7c05…

MALICIOUS

PDF

34.4 KB Created: 2020-08-23 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1ef054fa9fc2860ca297c030f244e4 SHA-1: 43dc04cd350084ba7bbbf719b1d45883b393d885 SHA-256: 027bfb8e659c7c052d8ad5b69a7e58d7bb093b434ef2b6526a14594673655a58
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=anggur+merah+2+trio+elexis
    • http://tafiw.carpetcleaningbyjeff.com/uploads/1/3/1/3/131380591/5995846.pdf
    • http://files.artistmikemeermann.com/uploads/1/3/2/7/132740399/56e2ee8fe8cce9.pdf
    • http://files.mingocarecbd.com/uploads/1/3/0/7/130740118/2810638.pdf
    • http://pikilufof.hhsclassof1979.com/uploads/1/3/0/8/130814229/lumemabegu.pdf
    • http://wujusap.politicalethnographyproject.org/uploads/1/3/1/3/131380183/pesovajoxowuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0008/5149/files/38520364354.pdf
    • https://cdn.shopify.com/s/files/1/0456/4651/2295/files/82223118199.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/assistant_brand_manager_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/resident_evil_5_treasures.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/30196563220.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/vuterutogeta.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/76741451283.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/food_and_beverage_cost_control_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/interview_questions_and_answers_tell_me_about_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3143/files/lol_cowsep_master_yi_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/zefizazutisuruxobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/zepawulapelaxuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/kifozigizul.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_off00004a4f.bin
0e4c91f38b975cc2ccbabc4e41eac4f371efb6ef3ebb2da364f2977e6da262b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4F 5288 bytes
font_01_sfnt_off00005c20.bin
a8e46dbdd7f574a330ccb934f77a7d54a6b339e087c495d822ce47c4e107a24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C20 9508 bytes

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