Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0e19e749da513b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-03 17:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d425e7a92f7f5d0a1c20d448ad1cb0 SHA-1: e8b7a3ee6138dfbf3acf4d156d491a4029eae732 SHA-256: 9b0e19e749da513ba0dc7bc32f08a33c743a922836b3cd09d07f82fb7a357cda
150 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a chemistry textbook. This link points to 'ttraff.ru', a known malicious redirector. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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=inter+1st+year+chemistry+book+pdf
    • http://files.draiochtshoppe.com/uploads/1/3/1/4/131406840/kedadu_moduvirewo_gidirajubosed.pdf
    • http://files.brendaniman.com/uploads/1/3/0/7/130775707/8081515.pdf
    • http://files.mrgshouse.com/uploads/1/3/0/8/130874253/fitasoxitatopu-soviv-jakari-xupifa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/86615297414.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/70054013220.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7741/files/rajifet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/4058276543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/96105958815.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/23352657466.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/xevomidezipidowovuxuxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3286/1079/files/invertebrate_zoology.pdf
    • https://cdn.shopify.com/s/files/1/0431/5198/2754/files/fikazil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/webabadanutiwar.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/fopemonog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/kazamig.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_off000058ff.bin
a8a0f8033a6dcbc9f4e0fe8b878f60241730d5cb94ded20aef4eb044bee214aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FF 5656 bytes
font_01_sfnt_off00006c1a.bin
091b216716bdd1bceb2dd3c91230a088718fa55836ec3c205baa1c5834d98181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1A 9780 bytes

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