Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4530d7927d8c800…

MALICIOUS

PDF

47.4 KB Created: 2020-08-18 14:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d00b0256ce27e5e269a4ec70c311d8d1 SHA-1: b4bafa2be3f83f972467511523091ad33d30edd3 SHA-256: c4530d7927d8c8007deacf843c451fc28130632d09e80ed4e0c92b2d6a9831e2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=sample+affidavit+legal+forms'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to obscure the malicious destination.

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=sample+affidavit+legal+forms
    • http://fijavedo.voiceofgodrevivalsministrie.org/uploads/1/3/1/3/131383478/2294a1c8c18043.pdf
    • http://fovisavip.stonehengebelleville.com/uploads/1/3/1/4/131437462/fugolusiti.pdf
    • http://fodabofab.livermoreinstruments.com/uploads/1/3/2/6/132681482/b204d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/last_meal_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/2974/9145/files/bhavani_ips_tamil_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/2962143261.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/tisapopitu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/42648762066.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7884/files/topographic_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/bizhub_c227_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/tiresomely_uniform_crossword_clue.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/fofilixenujunowukal.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/6._snf_sosyal_bilgiler_testi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/zejumexurikivumu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/modujof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/dazuwenaronigadad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/dracula_oxford_bookworms_download.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/
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/m

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006789.bin
036508f80bd6c643dcb5413c6497fe1ba23e01cc736ce17ec1121916eea24c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 5204 bytes
font_01_sfnt_off0000794a.bin
dab96aa1e2f1e28606c223ac00d0da5ae8fba69a7d072536d1a56af785af2777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794A 13152 bytes
font_02_sfnt_off0000a2ce.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CE 4324 bytes

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