Malicious PDF — malware analysis report

Static analysis result for SHA-256 168efc90e71ba6cd…

MALICIOUS

PDF

48.0 KB Created: 2020-08-11 07:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8000e276618fc55beeca18901fbcd797 SHA-1: 4c0a4304991bf0e279a253c64a7f6c3afda9e736 SHA-256: 168efc90e71ba6cdc6a4d01dd29cf1fe518dfba744a7d96aa2bc696daf8beaf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to malicious sites.

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=animals+and+their+young+ones+chart+pdf
    • http://suteka.susieastwestcenter.com/uploads/1/3/1/4/131438216/rirusuworadero-xabipuganov.pdf
    • http://files.americandeckingco.com/uploads/1/3/1/4/131437755/48300349a56a22.pdf
    • http://files.croptechseed.com/uploads/1/3/2/7/132712163/zugub_mobaruza_padabe_lijepixu.pdf
    • http://files.livingcoaster.com/uploads/1/3/1/0/131069978/duguja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/gamevimefoseruzu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/pezemawemawafojiwedake.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/xewozosafopukadezojin.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/free_used_car_bill_of_sale_ontario_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/65670587875.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/29291126232.pdf
    • https://cdn.shopify.com/s/files/1/0440/0293/4942/files/ragemebuzizifimoxezasinud.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1265/files/wotek.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/lava_lamp_random_number_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/7595/9973/files/grilled_chicken_recipes_in_malayalam_language.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/94683213293.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/daedalus_and_icarus_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/rifibusulunesaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/triple_bottom_line_sustainability.pdf
    • https://cdn.shopify.com/s/files/1/0445/4907/9204/files/divina_commedia_english.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071db.bin
8530b7257c7e23b087cc27cafb541739d1fa56bd257509c35b46d47f2eb8eb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 5660 bytes
font_01_sfnt_off000084ed.bin
3b6d7e7b95cec51768745e2041a60bb4c77c6e597a478f1aa19ccee488609f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84ED 14672 bytes

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