Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65a69b32c3e4b89…

MALICIOUS

PDF

45.8 KB Created: 2020-08-07 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ceac48bba42fa15540e5361b34dcf1 SHA-1: 0047fb477aeeb344dea797e5bb20422e8dc0ecc0 SHA-256: c65a69b32c3e4b8997883529ec731f2eb85a207b79e9896803d66a66811f32b0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=the+slave+girl+buchi+emecheta+pdf, which is flagged as a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links suggests a strategy to lure users to external, potentially malicious, content. No scripts were extracted from this sample.

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.com/pify?keyword=the+slave+girl+buchi+emecheta+pdf
    • http://files.mustardseedministries7.com/uploads/1/3/0/8/130874647/7b527274b6f338.pdf
    • http://files.metatalkcafe.com/uploads/1/3/1/8/131856992/liduv-vizalexap-nowisawitefuz.pdf
    • http://files.gamefishingangola.com/uploads/1/3/1/4/131483955/4390689.pdf
    • http://files.emaljesmykker.no/uploads/1/3/1/4/131409128/bebojoxuwogiluze.pdf
    • http://files.nexusvocalensemble.org/uploads/1/3/0/7/130776208/xobemejokifu_bukuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/greenhouse_effect_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/pogomigosenidawilatu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/biology_dictionary_a_z.pdf
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/the_bartender_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3905/4231/files/brche_klasse_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/72127252605.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/25972198879.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/gadivawerowovake.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/22282952399.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5846/files/jisajuxuwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006697.bin
4759989cee49e3c68f45f21113e44ff06c89794ede355827ae41eb6b86c62bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 5384 bytes
font_01_sfnt_off000078e7.bin
858646abacb118bbe0512bf2e74a239dff9e88c7307ac17df390eb4562ed1a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E7 10368 bytes
font_02_sfnt_off00009c32.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C32 4324 bytes

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