Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4354f61dd42005…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 19:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7587f12d8748815da336d49912aabd2 SHA-1: 262eb43aa04f496226f0f2999e78272767b1d007 SHA-256: 9f4354f61dd42005fa6810edfec55065b9d2dc2f16afd427650aafb1966f3a50
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=kelvinator%20concept%20air%20conditioner%20remote%20manual'. This URL is likely part of a phishing or malware distribution scheme. The document also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=kelvinator%20concept%20air%20conditioner%20remote%20manual
    • http://vodot.littleriverbc.org/uploads/1/3/0/7/130739536/ae41adfcbc.pdf
    • http://files.texasstaycations.com/uploads/1/3/2/6/132695511/vimitozebevudigo.pdf
    • http://files.ormsbyeditions.com/uploads/1/3/0/8/130814758/nafaworozupim_mekomotuviko_tamigerobejezo.pdf
    • http://files.reynoldavet.com/uploads/1/3/1/0/131070173/2162060.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/nodowovevusesusifixug.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5167/files/ups_certificate_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/wunobugorijukow.pdf
    • https://cdn.shopify.com/s/files/1/0448/9504/3751/files/16869716373.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0598/files/xemafuvetakudasuviziba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6313/9733/files/american_gods_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0439/8376/5662/files/perisetuzuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/learn_arabic_language_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/challenging_algebra_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/5131800425.pdf
    • https://cdn.shopify.com/s/files/1/0429/2201/6934/files/69089467447.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/61012745574.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/xuzewujisawapuvuwo.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/
    • https://cdn.shopify.com/s/files/1/0429/2201/6934/files/690894

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006536.bin
ece14dd43d0a137360fdc098e92ce01442367dc1c1c66d4382b3f952893c6bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6536 5072 bytes
font_01_sfnt_off00007660.bin
387c61186db583adcb71c11d43f8872798ca62b612f78c2dff0c0c05a45995f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 10516 bytes

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