Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7aa4e9e48b866d…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 17:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d097be5e9c1c3ee998187ed0501423f SHA-1: 5a2d6b080589c62a0adc8ccfce3879936d675739 SHA-256: 9f7aa4e9e48b866da86f2ec12ccf31096a413e749b161f4c0bd67d2bd22c6ccf
152 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 a malicious redirector link and a large number of external links, indicative of an SEO spam or phishing campaign. The primary malicious URL identified is ttraff.ru, which is known to host redirectors. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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.ru/pify?keyword=cricut+personal+electronic+cutter
    • http://files.hk100-ultra.com/uploads/1/3/1/4/131484328/foworo.pdf
    • http://files.littlelotuscafe.com/uploads/1/3/0/7/130775145/f889c0.pdf
    • http://files.mythoughtfulenglish.com/uploads/1/3/0/7/130739284/voveraka.pdf
    • http://files.cambridgeartfair.com/uploads/1/3/2/7/132740329/kogevuru.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/pubivojabosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/80369936896.pdf
    • https://cdn.shopify.com/s/files/1/0437/5363/5989/files/vasuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/22429144659.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/sikezofiwegifel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/55563756152.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/42023487341.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/plex_double_nat.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_off00005ca9.bin
a9cacbedadb827fa8793601b0e2c690ad27a4c46dfeb0499cd8672ff13e8e78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 4832 bytes
font_01_sfnt_off00006d20.bin
7a6476b13f970881cc26931ff8ff16646e450b7e44b0ccba68a42c2227779d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D20 9824 bytes

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