Malicious PDF — malware analysis report

Static analysis result for SHA-256 5554b4b48d530ab7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-25 01:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e78d22a8a90fb075830f6fc2e4eaeb4e SHA-1: 96f3d3bd47e61e690b2ad839c26fbf1c7c0c1d94 SHA-256: 5554b4b48d530ab7edfeef74c1b8c8ede370b2e3187706c0812f6274f956b0b3
154 Risk Score

Malware Insights

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

The PDF document is identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains but also several to unknown domains. The document body, though heavily obfuscated, contains the text 'Animal adaptations worksheets pdf' and the URL 'https://ttraff.ru/pify?keyword=animal+adaptations+worksheets+pdf', suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful 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.ru/pify?keyword=animal+adaptations+worksheets+pdf
    • http://xujinu.atlantamedicalaesthetics.com/uploads/1/3/0/7/130739777/c6ea93e14fc.pdf
    • http://files.sompbags.com/uploads/1/3/1/4/131437775/pajojojirazi.pdf
    • http://musoj.allcoinspections.com/uploads/1/3/1/4/131453194/kurifidaw_besufel_nemujeviwesixef.pdf
    • http://gonapinu.leadingedgeequine.com/uploads/1/3/2/6/132680835/9241252.pdf
    • http://files.divinefaithtarot.com/uploads/1/3/0/8/130813037/vaxifurokala_vafisenub_libux_xifagoratufuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/zokimovikinibami.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/24366154781.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/passive_voice_exercises_all_tenses_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/calculator_soup_greatest_common_factor.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/maplestory_marksman_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4263/4917/files/photoshop_effects_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0700/9180/files/dugexuloderujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4337/files/28468108011.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/disesubedevekemoju.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/31893212486.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/xewijokizinedalumanaviwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/kaxepimuvodetisudaku.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_off00006078.bin
df7f14abcc0e58433dc0020465854e18d6fbfb62cccb0f419c6cde9bf4955132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 5424 bytes
font_01_sfnt_off000072c9.bin
9626fca6fec587df55a3982227075588bd355b433942b8b60d34f2ca6d1029c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 10136 bytes

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