Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b2335de57e0db3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-01 17:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7b9524704fd9bd06b991aefa8a3e43 SHA-1: 3bf0d915c0370104598e7415a291f65b19b8f6dc SHA-256: a4b2335de57e0db349bafc4179995d0a7a673235918c543253f025d1d7a18ef1
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded external links, forming a link farm. One critical heuristic firing indicates that these links lead to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=i-+129f+cover+letter, which is likely used for phishing or malware distribution. No scripts were extracted from this sample.

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=i-+129f+cover+letter
    • http://files.mohitdubey.com/uploads/1/3/1/6/131606636/32c2214.pdf
    • http://files.wildcatrollerhockey.com/uploads/1/3/2/8/132815343/fedarup-zajamadef.pdf
    • http://files.undertheirrelevance.com/uploads/1/3/1/4/131438843/dijafesig.pdf
    • http://files.herbssupply.com/uploads/1/3/0/7/130775200/mekivukopatar-sazufexi-rewarofubup.pdf
    • http://files.gobrazil.co.uk/uploads/1/3/2/7/132741211/sunupisamojoxer.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/14918029521.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/75290023841.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/robaderakiredexagif.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/namagufadekidexin.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/vimovutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/sefokalegexebaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/xovajogitiwukumorawud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9017/files/pujipakatenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/89182568797.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/pufebuleruvejufom.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/62240086332.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/letipazisu.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_off00006337.bin
e5bbb7c81e39e4faeab287f94b0cd5153440ea500f5eb85586c0e31ac8cd20e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 4856 bytes
font_01_sfnt_off000073ea.bin
48f57622094978ce52e38e26420d8c5cb5bd3769a6470fdee3e8c01f18e797d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 10488 bytes

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