Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6ea08f5f3b3695…

MALICIOUS

PDF

48.7 KB Created: 2020-08-23 17:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185e412fe86eb3ef7f6b5bc1071858a1 SHA-1: 530921d701fbe8adb87424fe0c8e1c5cee8c9fa2 SHA-256: af6ea08f5f3b3695553698478266b3c5fea3c6187edf819a96c2b5a3c456f4e3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, also contains the same malicious URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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=understanding+the+geologic+time+scale+worksheet+answers
    • http://files.bloorstreetsound.com/uploads/1/3/0/8/130814290/242bb.pdf
    • http://files.musicultinc.com/uploads/1/3/0/8/130873921/nesomibitege_dobeniw_vutatimorukebef_bogadedikapip.pdf
    • http://vobefe.safeharbour.com.sg/uploads/1/3/1/4/131453133/616aca0552.pdf
    • http://files.purerockcolours.com/uploads/1/3/1/3/131398129/gelujukike.pdf
    • http://dijokix.nhvfd18.org/uploads/1/3/0/7/130739595/pewukewuxenamuv_tiwad_tuwudoguzolol_mopab.pdf
    • https://cdn.shopify.com/s/files/1/0440/5637/9557/files/grade_10_biology_textbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/chronometer_android_countdown.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/86368327279.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/kayaking_merit_badge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0451/4293/3657/files/maths_10_cbse_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/barium_chloride_dihydrate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/84482415173.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/20974298140.pdf
    • https://cdn.shopify.com/s/files/1/0440/5100/5590/files/cons_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/68782958382.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5129/files/68212518114.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/51684576977.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_off00007e47.bin
ecebd1ba56b0b7c87cb2fe3039b2f81bcdf9e22cbb48f916c53de8c61a911532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E47 5500 bytes
font_01_sfnt_off000090da.bin
ca8fc013ad9eea477dd1edccefeab71ec83cffb3e211fc8e70e37df4d6237117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DA 10664 bytes

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