Malicious PDF — malware analysis report

Static analysis result for SHA-256 386e12a433d9c0e7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 21:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4a4b643414de86ef2befb783bf911e SHA-1: 32b194dfd5b05f394e6999da38c881dc3da87ee4 SHA-256: 386e12a433d9c0e7065291579549dea2ad41896d1245ca90dc3f71b618937f4d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=1995+corvette+owners+manual, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous external PDF links indicates a potential SEO manipulation or link farm tactic.

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/wix?keyword=1995+corvette+owners+manual
    • https://static.usrfiles.com/ugd/b8c837_32d97ab57f0a47c9ab6851cf43d13cac.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59049d69c4b45eb975085bc52814b9f.pdf
    • https://static.usrfiles.com/ugd/238140_49766b6077d6498a997f29d4c869a5f9.pdf
    • https://static.usrfiles.com/ugd/ba3095_2de2cf17ab7744d494120324d6657860.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fdb069ff4f04dcbb37ab1446f3308e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_52211d9f9575419aa4e67792eeb96d23.pdf
    • https://static.usrfiles.com/ugd/217d68_24e71e164cd9422db96c01ba3c723ef0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce93d7e56684d80976aec5ef8e902b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9fdd1a1bcdd489484aa97302ab25be8.pdf
    • https://static.usrfiles.com/ugd/4b7290_6650798aaecb453482aa2a7706ea0e73.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0f4b80d85d444b39ac73b639e11c68e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3279adcd308141108f647b98d0b30610.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/14987891765.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/mastoidite_traitement.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/12627223879.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/45046304780.pdf
    • https://cdn.shopify.com/s/files/1/0447/3857/6533/files/acethinker_video_downloader.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_off000060ea.bin
a84a97d81bec95416fc9fdf1e8e856ce70dc6a22dc898bf475184bfe9f994cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 5336 bytes
font_01_sfnt_off0000730d.bin
ceebab6320e7eb2cc1c1d6c1e3c5914e2c109b85924c23d5da9936539eb58d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x730D 10956 bytes

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