Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90772c5418d4d94…

MALICIOUS

PDF

37.8 KB Created: 2020-08-24 04:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9176f13f0db442b802ef559283f8cf6 SHA-1: 4c3b1715c3d92613dd2dd2de6ac4b665903ebdc6 SHA-256: b90772c5418d4d94263e7dd842822dfe56343f7bb77757bb8ca102e57350b127
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains the phrase 'Modern welding lab workbook answers' and the malicious redirector URL, suggesting a lure to potentially malicious content disguised as educational material. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=modern+welding+lab+workbook+answers
    • http://lisup.scotsresearch.org/uploads/1/3/0/7/130775478/462408.pdf
    • http://sujorul.denisedurkinartwork.com/uploads/1/3/1/4/131482975/sosepodesidanenag.pdf
    • http://nulota.handsupoutofpoverty.com/uploads/1/3/2/8/132815180/pukipu-litonigerim.pdf
    • http://files.collaboratoryshows.com/uploads/1/3/2/7/132740553/9991933.pdf
    • http://zigowu.abdullah-francis.com/uploads/1/3/1/8/131857114/diwukaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6914/4230/files/hourly_forecast_for_pasadena_md.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/deraruroraxuguvikano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/78218719087.pdf
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/android_emulator_for_pc_for_pubg_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/goldman_cecil_textbook_of_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/adverb_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/jalekubozawatiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/biometric_access_control_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/3753612416.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/alphagan_p_dosage_information.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/zolatolebowijugumirukag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/chsp_respite_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/calf_muscle_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/ximowarola.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/jawesadiratibopibulutafo.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_off00005602.bin
8cc6de7ee92331089533e8c979625900f5af2023c0499ecdb79bdb4e99ee2c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5602 5292 bytes
font_01_sfnt_off00006825.bin
73ec18eb3df059e131badd8afcd039c6869051bbeee534f96b8d47f24942f96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 9860 bytes

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