Malicious PDF — malware analysis report

Static analysis result for SHA-256 968838a6de78d28e…

MALICIOUS

PDF

71.8 KB Created: 2020-08-09 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a65a12d3d3f9a1058e4d8309e037ba SHA-1: 43485566414d3ddab0010743c1df103eb1755cbc SHA-256: 968838a6de78d28e8594765b554284616eca6609e4d16458e40f7424143f52da
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL 'https://ttraff.com/pify?keyword=digestion+y+absorcion+de+los+carbohidratos+pdf' is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting it is the primary lure. 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.com/pify?keyword=digestion+y+absorcion+de+los+carbohidratos+pdf
    • http://files.thesciencezone.org/uploads/1/3/1/4/131413718/muxiveli_visozenupedag_webetiwu.pdf
    • http://files.soundescapemusictherapy.com.au/uploads/1/3/0/7/130739309/galatu-monirukejowus.pdf
    • http://kagalib.ohiodentallaboratory.com/uploads/1/3/1/6/131637136/4941754.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/33661553479.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/cbr_test_procedure_for_soil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1126/files/32291054938.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/john_deere_7000_planter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/38106887705.pdf
    • https://cdn.shopify.com/s/files/1/0437/5760/0920/files/lameruzaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/vasajajomedosijal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66456909559.pdf
    • https://cdn.shopify.com/s/files/1/0432/0804/8808/files/pepufiwusuvitibiwonujek.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/linevoxuwekizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/nafureluronejuxokijovurur.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/opencl_error_codes.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_off0000d87d.bin
3b129d985d2a69fd5f074cd67cf2620b4d215917abf6987cefa8f9b9b28a4ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 5660 bytes
font_01_sfnt_off0000ebbd.bin
1cb568590734ccf632bbcd042b2ca0316b05bdbbeac036bcb6de5df529725fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 11016 bytes

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