Malicious PDF — malware analysis report

Static analysis result for SHA-256 389e73cb6fc0d41f…

MALICIOUS

PDF

32.4 KB Created: 2020-08-21 19:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2793ec1ba93d29f0203618378206015 SHA-1: f444e1fde73ed81608e15b97be72d3ba6ebf6822 SHA-256: 389e73cb6fc0d41fb11f905b2983c151ed56b063b283a6c59145f0b6b1e09f32
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The primary malicious URL is https://ttraff.cc/pify?keyword=age+calculator+app+apk, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to the malicious URL and other external links, reinforcing the social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=age+calculator+app+apk
    • http://files.theapostoliccommunion.org/uploads/1/3/0/7/130738978/2941146.pdf
    • http://files.blackhawkbrigade.com/uploads/1/3/1/4/131455198/tevuzizube_fuwimobave.pdf
    • http://files.ef-gsm.co.za/uploads/1/3/0/8/130814232/faniwodidej.pdf
    • https://cdn.shopify.com/s/files/1/0430/6151/0293/files/96903787092.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/babafideti.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/jurnal_bronkitis_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7054/5308/files/vuziguwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/miwutozikuzezomix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/sokevejazididofozaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/78229748602.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/bharat_acharya_microcontroller_book.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_off000041cd.bin
2776ebc96ea98f585664cb7d2446451e1774d8dc10391e5a2cd2d69b943acb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41CD 4976 bytes
font_01_sfnt_off000052cc.bin
b34a415727dc638a905711bd276f20c1a822c327f860306a8932bb2d5410d1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52CC 10096 bytes

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