Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6281bafaf3d7031…

MALICIOUS

PDF

47.7 KB Created: 2020-08-21 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2642bde25ad0de13f146f108c36b655c SHA-1: e12cc030e40f95a02ed579f6bbb897e70bdb7c36 SHA-256: b6281bafaf3d70315dd9319eb0860dd5958f2844f0f971bcdb4ae42dc727aad4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, many hosted on cdn.shopify.com. The document body text, though partially corrupted, contains the string 'Android go version apps' and a URL that matches the redirector link, suggesting a lure to download malicious applications or redirect to further malicious content.

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=android+go+version+apps
    • http://files.emotionallyfocussedeating.com/uploads/1/3/1/3/131384777/juraramadasinasub.pdf
    • http://files.wordcraftoforegon.com/uploads/1/3/2/6/132682235/44f3077b5.pdf
    • http://nunetu.realtimechallenges.com/uploads/1/3/1/3/131398140/9207d05b1209eb8.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/28708936530.pdf
    • https://cdn.shopify.com/s/files/1/0462/6140/3802/files/fawidevovisab.pdf
    • https://cdn.shopify.com/s/files/1/0460/6987/4852/files/implosion_apk_obb_full.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/pugamejizifujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/misetuwejolimilugoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/kidefozululapore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/boojum_burrito_bowl_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/9756/3037/files/60345966471.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/81762802136.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/31466643199.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/noladex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/critical_point_calculator.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_off00007d0c.bin
bc60c6851f7d65a7f0e2756ececea8aab7703c04e7667d7964220d1e7b0db012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0C 5144 bytes
font_01_sfnt_off00008ea1.bin
5580c9107a85ea1863607a0b0e5f560efcc214f0b7a86e7b5aeb1ad6a0708802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA1 10364 bytes

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