Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f026696325180c…

MALICIOUS

PDF

48.8 KB Created: 2020-08-02 19:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb2a5c49b946222cbdaead828e1a378 SHA-1: 7ab9535d4fd0c17468936d04d4346df4744d6b81 SHA-256: 21f026696325180c1f4dcfccda218ddd8a961ce4430f293e7945aa62fc1e88aa
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=pokemon+soul+silver+for+sale`. The document body, though heavily obfuscated, contains text related to 'Pokemon soul silver for sale' and the URLs, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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=pokemon+soul+silver+for+sale
    • http://files.tabithastgermain.com/uploads/1/3/1/4/131409755/3936343.pdf
    • http://files.andysidornxtlvlfit.com/uploads/1/3/2/7/132741430/tutasu_jozev.pdf
    • http://files.bodoheiliger.com/uploads/1/3/2/8/132815367/4119678.pdf
    • http://files.elder-well.net/uploads/1/3/1/4/131437924/tojuja_tomafivu.pdf
    • http://files.vandoorencounselling.com/uploads/1/3/1/6/131607062/widopasufapobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/xivemafojesixek.pdf
    • https://cdn.shopify.com/s/files/1/0429/4633/0791/files/jubupunozopuziwokujax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3829/files/silizudofuvojajuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/mafevasiselifuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/julapuzibomekilumara.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/19441993365.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/5042482166.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/rewivijus.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/56227619168.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/32286963389.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/hyundai_wiring_diagrams_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/css_shadow_bottom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/dafaxita.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_off0000707b.bin
7a5854717127d79b24b860c26bea24d9ef4b0ad0d6667991292668af492b0d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 5040 bytes
font_01_sfnt_off00008197.bin
f3ff91f96a168686b1c4c765d457c179e7726876e0a77066a1b7e1eb0414d14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 16848 bytes

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