Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55e4f82d51f8564…

MALICIOUS

PDF

55.1 KB Created: 2020-08-28 05:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d789b2cb6845d0f32968b8aab771debd SHA-1: 527d6486793f96e04f4699dc5bdb65fcbf06657d SHA-256: e55e4f82d51f8564ec2cf03ff83863bf41c79f91bfbfc3cb4f8cf2d213e68963
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body itself contains numerous embedded URLs, many of which are part of a link farm, with the primary malicious URL being 'https://ttraff.ru/pify?keyword=escherichia+coli+pruebas+bioquimicas'. This suggests the PDF is used to distribute malicious content or lead users to phishing sites by obscuring the true destination through redirectors.

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=escherichia+coli+pruebas+bioquimicas
    • http://bulij.slovak-tourguide.com/uploads/1/3/1/1/131164250/6516701.pdf
    • http://lugasilod.katiemachain.com/uploads/1/3/2/8/132814930/69127daaccacf.pdf
    • http://wanul.thegreatescape4u.com/uploads/1/3/0/7/130775125/fukojogoninefa_mixapij_likomusodevi_tebatanavudej.pdf
    • http://files.smyrnafoundation.com/uploads/1/3/0/9/130969430/legetufone.pdf
    • http://wekob.clinpsychsarah.com/uploads/1/3/0/8/130874493/nokilavevabamek_fazapuditowuzu_faguva_puvem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/53302363028.pdf
    • https://cdn.shopify.com/s/files/1/0452/5621/2640/files/brief_calculus_and_its_applications_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/ambareesha_film_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0459/1665/1669/files/bofenojusakojizegaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/6558486239.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/69892879567.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7125/files/55622783934.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/all_formula_of_math.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/mijizuxokudogenotalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5458/files/2018_tamil_hd_movies_websites.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/emo_love_songs.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_off00009666.bin
5e4a980a7a034e193a9af5df5818a916b1cc751ad46d244ce68fcdb92b2097ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9666 5396 bytes
font_01_sfnt_off0000a897.bin
e8d89266ab8996c01090ecdc3e4561bdca2b652f56e87f9bc9d4a5cdef8dfb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA897 11596 bytes

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