Malicious PDF — malware analysis report

Static analysis result for SHA-256 d939a85934043405…

MALICIOUS

PDF

50.0 KB Created: 2020-08-20 03:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eebbef32ebcee2dafda3072c7598d94 SHA-1: 3c17a024fc0bf89ee2d5dcb763acf80c6215dbfe SHA-256: d939a85934043405cc225619c2292e06b14bdb0809cf2d9a2abe0899502861f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, appears to contain text related to sheet music and includes the malicious URL. The presence of a large number of external PDF links, many hosted on `cdn.shopify.com`, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=head+over+heels+broadway+sheet+music
    • http://files.womenforearth.org/uploads/1/3/1/4/131407737/tidumevafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/bal_ganesh_cartoon_3gp_video.pdf
    • https://cdn.shopify.com/s/files/1/0439/0528/6296/files/auditing_standards_and_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/video_2_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/guarantee_certificate_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/zatafevemareju.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/cpm_homework_answers_chapter_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/zearn_student_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/sovulobinovir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/26699808738.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/10067161004.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/tipos_de_capacitores_electroliticos.pdf
    • https://cdn.shopify.com/s/files/1/0437/4488/6945/files/crazy_train_sheet_music_boss.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d99.bin
a1d3b189d662a8bcfbc3d6aa63bdb602b2060a5f9f55fee75bcb2d21b95ec7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 5536 bytes
font_01_sfnt_off00008056.bin
b736267bd6227644d7fd11adeea3236d9435773dbbef4f9b939479d10d33ce87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 11072 bytes
font_02_sfnt_off0000a624.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA624 16092 bytes

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