Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8112cda08c683ce…

MALICIOUS

PDF

57.0 KB Created: 2020-08-12 09:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063dd3f8a8ec15ff40ebb1d851f63668 SHA-1: 02fdee8b7f1200dcac07586376ab084942ce72d0 SHA-256: f8112cda08c683ceee45e6c5cbf7c5c08d284339ec80571bf6035af984c0d768
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with a critical heuristic identifying a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to downloading free PDF books, aligning with the redirector's keyword. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, sites.

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.ru/pify?keyword=website+to+download+free+pdf+books+quora
    • http://files.theindestructiblesbook.com/uploads/1/3/0/9/130969810/9985313.pdf
    • http://files.mingateachers.org/uploads/1/3/0/8/130813948/8279421.pdf
    • http://files.jonnywilderness.com/uploads/1/3/1/4/131452804/gemeni_kexodipav_dejuwugazexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/xejeludaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/peguwaxafagedowojinuzofok.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/fl_studio_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/2169/6149/files/minecraft_pe_cities.pdf
    • https://cdn.shopify.com/s/files/1/0437/4088/9240/files/39623208857.pdf
    • https://cdn.shopify.com/s/files/1/0444/4746/5639/files/69549418526.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/pujumujesamufilafigakim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/vegikiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4764/files/human_activities_and_their_effects_on_the_environment.pdf
    • https://cdn.shopify.com/s/files/1/0439/2386/5768/files/36507223112.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000747e.bin
7932c4f3fb058c6f48c71605d8784d52473a0f293d5d6a0fd89bba76eae2d7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747E 5352 bytes
font_01_sfnt_off000086c1.bin
dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 1796 bytes
font_02_sfnt_off00008f4b.bin
a1e03114b8041990e09aef1aa613eb288f04b338418edd4bc4bd1275037e1b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4B 10180 bytes
font_03_sfnt_off0000b24d.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16312 bytes
font_04_sfnt_off0000c7d9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 4324 bytes

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