Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cf7fc43b3d8f06…

MALICIOUS

PDF

83.5 KB Created: 2020-08-08 22:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6138cfbc0b0abd51f9321e2fa202f82 SHA-1: 33ed38de980d4d65f6255f52068d6f7103e4d6a3 SHA-256: 54cf7fc43b3d8f062212e7d5a81473ad0a8e170e65c4aa6555a7e6455d0eea50
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wb?keyword=istanbul%20travel%20guide%20pdf'. Additionally, a high-severity ML classifier flagged the PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also hosts a large number of external links, many hosted on cdn.shopify.com, indicating a link farm strategy.

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/wb?keyword=istanbul%20travel%20guide%20pdf
    • http://wojaziw.theslosscrew.com/uploads/1/3/2/7/132710621/levubobipofu_mowizaberalukuj_vogafu.pdf
    • http://files.undauntedcolorguard.org/uploads/1/3/0/8/130813413/6809596.pdf
    • http://files.dropby2day.com/uploads/1/3/2/6/132696117/6839014.pdf
    • https://cdn.shopify.com/s/files/1/0437/8738/7037/files/bazit.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/sirekeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/manga_de_sailor_moon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/wavesabenoloburadesule.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/30106679236.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/86316472905.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/17489954958.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/bus_architecture_of_8085_microprocessor.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/duzemowasuvurifixatof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/14542056616.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/sonokuzor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/godikuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/farobopijumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/livetus.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_off0000e905.bin
262c195598ac1a98cbb048f02d3dc44981e7dfd5de130aeb2df2cceb1828cdba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5348 bytes
font_01_sfnt_off0000fb44.bin
6175c611c54dc4f4573b10398b39d3287cb16dc1eb3b89e5d4cbe58aaed63a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 15476 bytes
font_02_sfnt_off00012b36.bin
2998ba902476debafacfaad6f45403e44352055ee498314c2d3a56defa64a2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 16140 bytes

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