Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e56240a6800d877…

MALICIOUS

PDF

35.9 KB Created: 2020-08-22 06:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecc173326704af4126f58e48ad9c4366 SHA-1: ad7a939832b665d2c197161c2329bc90995de523 SHA-256: 8e56240a6800d8779ee6cf24e8865d76dbf83e0b0ed868b0480bb9cd0d648ce2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a worksheet for comparative and superlative adjectives. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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=comparative+and+superlative+adjectives+worksheet+grade+3
    • http://files.1550art.com/uploads/1/3/2/8/132814342/figojudeb.pdf
    • http://files.mrsargus.com/uploads/1/3/1/8/131857540/dilukafisafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/escalas_de_acordeon_de_botones_en_sol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/29855652215.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/irritable_bowel_syndrome_diet_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0463/9693/2251/files/free_timeline_powerpoint_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/4_c_s_of_marketing_by_philip_kotler.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/me_akela_ji_raha_hu_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/zaripeluzirim.pdf
    • https://cdn.shopify.com/s/files/1/0451/8169/8199/files/day_by_day_armageddon_beyond_exile.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/10635522644.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/zufijiwudutokafuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/pirodisojene.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/allegory_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/20671714404.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/66375929801.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/bivosusefavovepazaguna.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_off00004c18.bin
5726e28aae9b613ae938cb0c7aefeeba0c571c810872e164948acc358a1b0dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C18 5848 bytes
font_01_sfnt_off00005fed.bin
236bab493661ddff554e7e0e6d8e94106fbb727e1cde23df98a4a71360fec974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 9984 bytes

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