Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e8b636993dacc0…

MALICIOUS

PDF

57.9 KB Created: 2020-08-14 09:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 981d8460902f3091f8da1c1d9d8fd0a0 SHA-1: c9130e1b40b2c883127721654d8183a640e69e93 SHA-256: a0e8b636993dacc0420c34aabf169e5eb45d75dae4abd9e10ec4d8e5841de2db
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=bayesian+classifier+pdf`, which is likely used to redirect users to a malicious destination. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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=bayesian+classifier+pdf
    • http://files.rebeccathompson.ca/uploads/1/3/2/8/132814476/dopifowetazusumum.pdf
    • http://fupik.lifeworksgym.net/uploads/1/3/0/7/130739892/magafelujig.pdf
    • http://files.silkysbrooklyn.com/uploads/1/3/1/8/131871633/xepegof_jugekedovelosej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/scott_foresman_science_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/tirurefixomuzawevin.pdf
    • https://cdn.shopify.com/s/files/1/0440/0673/6037/files/86791672982.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/jejaxusumagozuzumin.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/naketa.pdf
    • https://cdn.shopify.com/s/files/1/0451/0954/3077/files/budget_making_process.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/10541007144.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/88222877644.pdf
    • https://cdn.shopify.com/s/files/1/0445/8987/5364/files/90875677097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zijilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/50365568547.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/mogobigovududobutokuguza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/mivoralepolegubud.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079dd.bin
f7085ee332bc58454d6596255c733c973904023154c1800dfbe6aeb87f12ae5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DD 4896 bytes
font_01_sfnt_off00008a8a.bin
081d6d3ecbef0f887a09137cd1502d639f945ef321bc346bf672ea72fd05234e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8A 14416 bytes
font_02_sfnt_off0000b7ce.bin
5617ec9627a8ab3ec6258a90d9208e20427de2a6b8b5195bb6b34d6d8d69fe18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CE 16076 bytes
font_03_sfnt_off0000cc7c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 4324 bytes

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