Malicious PDF — malware analysis report

Static analysis result for SHA-256 350cb9c35fb7942b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 21:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7dd5d20323161055ef00a77696af597 SHA-1: ee84219d0f885a674e3d63e257c2125508decb21 SHA-256: 350cb9c35fb7942b90012f00b340d6ae4079547a235555f7325755be281bc458
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=kathi+sandai++starmusiq'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same suspicious URL and a reference to 'wkhtmltopdf', suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=kathi+sandai++starmusiq
    • http://files.intrepidprogramme.com/uploads/1/3/1/4/131438899/9406050.pdf
    • http://zeduvisas.cmeasbs.com/uploads/1/3/1/6/131636648/xofurilifolo.pdf
    • http://files.annawitte.org/uploads/1/3/0/7/130775675/loboduzelusanexaxit.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/2908684191.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/cs6_keygen_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/kuloluliwazosobofid.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/wijekimezisarerumirim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/tatajetil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/23394950229.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/junepovadefeguma.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/69151763372.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_off00006141.bin
d5c0b848f2bfcabba5397113b9c59cce29450b4ab8f5d933cdaababcabe3d718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6141 5128 bytes
font_01_sfnt_off00007276.bin
c5cb70e11c7ffcade3b3e630715c32949217f78a2ecb41a74c4898cbc4cc0bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 9760 bytes
font_02_sfnt_off00009419.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 16164 bytes

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