Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9685efb063b824…

MALICIOUS

PDF

41.6 KB Created: 2020-08-11 14:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf49c84f0e0c0edf30cbf3488f29c02 SHA-1: 49bec76251aa913e0b9dae06ba48232df903b456 SHA-256: cb9685efb063b824d2f83369dea2e140819d5aab02a0aea876b9305cfcfcf2c4
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically directing users to 'https://ttraff.com/pify?keyword=allopathy+in+tamil+pdf'. The document body, though heavily obfuscated, contains this URL and appears to be a lure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted from this sample.

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=allopathy+in+tamil+pdf
    • http://files.singaporelawngames.co/uploads/1/3/2/7/132740327/tefifatas.pdf
    • http://files.aworldofbeads.com/uploads/1/3/1/3/131398131/f95e3788.pdf
    • http://fujowipul.stilemoderno.org/uploads/1/3/1/4/131453598/zeginekuja.pdf
    • http://fiwena.dulleslibrary.com/uploads/1/3/2/8/132814930/6727548.pdf
    • http://files.cheersfromthewasteland.com/uploads/1/3/2/3/132302780/zitoxero.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/94945336273.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/51251291699.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/google_cardboard_blueprint.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/5507737707.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/5170770293.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/84729216549.pdf
    • https://cdn.shopify.com/s/files/1/0443/8091/3830/files/bedtime_stories_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/how_to_give_yourself_levels_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/32590213139.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/duniyadari_marathi_kadambari_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/33247851798.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3586/files/4340629012.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/batumomokolu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006608.bin
73f21263c56c6d0b5cd566cd3af06bf203a2391e31c0749ecf7f00ca151b0335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6608 5100 bytes
font_01_sfnt_off00007739.bin
b4401ec5e235b47746964d881782b9e508aeb6fc400f089768acce8d8af447e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7739 10060 bytes

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