Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d9d2750bb27b33…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 09:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f425c47de91254aac60c95e3d4a34527 SHA-1: a3cce737fdf6ed3981629dbb4d27b81eb2b5c298 SHA-256: b8d9d2750bb27b33ed1a5975e1c64639d88062581d1ed71fd517200389ea8a5d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.cc' is flagged as a malicious redirector. The document body, though heavily obfuscated, includes the same search query and URLs, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=bass+guitar+sheet+music+free+pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6908/files/pimorutet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/getotujebok.pdf
    • https://cdn.shopify.com/s/files/1/0430/2697/2825/files/hiperplasia_benigna_de_prostata_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/jso_inmate_mugshot.pdf
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/autumn_leaves_piano_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/42327201871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://static.usrfiles.com/ugd/599026_e02bf9d758d84f4cbee0f87f26974249.pdf
    • https://static.usrfiles.com/ugd/912de2_fe1d0b6c154840d39ad9412516cb397c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0f184f9bf4349768a38ab38577e1672.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd43c14f88954335ae0f6564ca109218.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/materi_pendidikan_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/wimiloxabaretugigisumun.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/17967040780.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_off000056f9.bin
68d5140ecb014d345ed2bcda259e05ab3030c3e808b19cda45d011dc5b01a7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F9 5252 bytes
font_01_sfnt_off000068dc.bin
5328040efb9eb212c371ec07f72d0563bf4b24bbd6e38da8a9a048aa47266e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 10316 bytes
font_02_sfnt_off00008c23.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C23 4324 bytes

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