Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f67a2560fb8bc37…

MALICIOUS

PDF

52.1 KB Created: 2020-08-15 00:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a3edf7469315cc4ab895cf9b1fab163 SHA-1: 3073da8dca8961d9c5f429b96f396c5092b88879 SHA-256: 5f67a2560fb8bc37b516bff1cddec8bb81cf2442ae663610320b7374bdf5d20b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body text, though partially obfuscated, includes a URL that appears to be part of a link farm designed to attract traffic. This suggests the primary goal is to redirect users to potentially malicious websites.

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/wb?keyword=understanding%20individual%20differences%20pdf
    • http://files.artbyelinor.com/uploads/1/3/2/6/132681337/2854796.pdf
    • http://files.katenesbit.com/uploads/1/3/2/7/132712661/95c66e871c7.pdf
    • http://files.impulsestudioboutique.com/uploads/1/3/1/3/131380687/palalasakoji.pdf
    • http://jumuzura.morrisadvohealth.com/uploads/1/3/1/3/131379444/28a2c2a04af.pdf
    • http://files.clearlakeecoretreat.com/uploads/1/3/1/4/131438641/4030662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/gta_3_android_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/12_bar_blues_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/comparative_and_superlative_adjectives_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/3679/3237/files/biotic_and_abiotic_factors_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/kofowazivunobixuzezosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8698/6908/files/32739560849.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/65371349104.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/52104106863.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/legujafuvogewosewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/foweredod.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a62a.bin
21c48de449849f7b692e0ba5be1df6b2329e582e49cbcf9f171794b25a344df3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA62A 18392 bytes
font_00_sfnt_off00006ffe.bin
2732fd7a5e2b9df43e63f34178ddfa197e860b2173156654ab0a65b8b044aebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 5376 bytes
font_01_sfnt_off0000825a.bin
398d478372fa59be510909adfdd68fea46f9a6f2c398429bc4bcaf9ef978e141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825A 10476 bytes

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