Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5975eb0e8ebf921…

MALICIOUS

PDF

34.0 KB Created: 2020-08-06 20:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1686bb696eaeca3e74d375cc02574c7b SHA-1: 39372611c9e7ada96822747e5f1a4f8a0bab1c0b SHA-256: a5975eb0e8ebf9219c535e1a4a794825ee1077afc9882be8ca6c668005ce879c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the string "cashflow game pdf" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=cashflow+game+pdf
    • http://files.sarahmacillustration.com/uploads/1/3/0/7/130775918/6504774.pdf
    • http://files.muellerhomeenvironment.com/uploads/1/3/1/6/131607103/c4118120827f703.pdf
    • http://files.cospempowered.org/uploads/1/3/1/3/131384101/4968865.pdf
    • http://files.centennialconcrete.org/uploads/1/3/1/8/131856170/nituvoronagal.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/15872291545.pdf
    • https://cdn.shopify.com/s/files/1/0430/2287/6826/files/61782732935.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/15315678531.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/98344144941.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/vikapubitarasedi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7976/1061/files/munevufesuzulonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/celestina_castellano_antiguo_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/34796043704.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/garejapajitadeze.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/megazutikubujatagem.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/12065878168.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/denedawijamewuvuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7350/files/port_authority_bus_terminal_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.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_off000047de.bin
a1d849fa9b81cc4570df4ff3edfc6d41ecc881e768baa4b0dde6df077f848c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x47DE 5356 bytes
font_01_sfnt_off00005a08.bin
100919b399bd0a5d7ecf96dbb2ecb528d7bd7ec5d17230743bfd298485173d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 10108 bytes