Malicious PDF — malware analysis report

Static analysis result for SHA-256 021d78fef7c45c65…

MALICIOUS

PDF

57.3 KB Created: 2020-08-10 17:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c5759d7419c94b678ce86e8d6f24d686 SHA-1: 6a6915bd056cfae9b031bad957106f934f1b2051 SHA-256: 021d78fef7c45c65eda59ae797ed4d66df100937a2261f6a59e91994ab461009
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on Shopify domains but appear to be part of a link farm. A critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. 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=breakthrough+advertising+summary+pdf In PDF document text
    • http://files.piscasaw.com/uploads/1/3/1/3/131398515/ca5666ae6.pdfIn PDF document text
    • http://files.crockettflorist.com/uploads/1/3/1/0/131070872/likagujaxikekorawod.pdfIn PDF document text
    • http://meronu.celebrationcroquet.com/uploads/1/3/1/4/131454549/winaxu.pdfIn PDF document text
    • http://files.leconfieldwsc.com/uploads/1/3/1/3/131384333/kuzosaw.pdfIn PDF document text
    • http://files.jillcranwellwarner.com/uploads/1/3/1/3/131398125/libir-fuxixipajujazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/fogutiwiwegawaju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6232/8472/files/76613428600.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/nuvazalokuxijedumitokesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/68006850816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/the_adventures_of_tom_sawyer_penguin_readers_level_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/jusuxesorojajakonek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/20059866058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/caustic_3_manual_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/49863135032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/30598960077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/benchmarking_journal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E1 5580 bytes
SHA-256: ff39b2f7cf97003b2e269fe441609618772e1b877f9b45f9bb7c122900b5d07a
font_01_sfnt_off0000a4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4C0 10944 bytes
SHA-256: 9800f39416367004fc4c91436828a8b585742aea7c92e2a4a8858b4226933086
font_02_sfnt_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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