Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97d76f8462bd77f…

MALICIOUS

PDF

44.8 KB Created: 2020-08-01 09:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f340b2e5c5e946e1b9733792f1253d0c SHA-1: bdd09b251341f87312f6ff9123e44e7fab455ce2 SHA-256: d97d76f8462bd77f2c7911499dec6878a260c78b081d39a4a2f4a00c29bf4d61
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string "javascript age calculator" and the malicious URL, suggesting a lure to a malicious website. The presence of a large number of links to other PDFs indicates a link farm or SEO poisoning attempt.

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=javascript+age+calculator
    • http://files.twistedpantry.com/uploads/1/3/1/4/131437242/8b56b86be93.pdf
    • http://files.parentsforsocialjustice.org/uploads/1/3/1/4/131455636/waxoremujil.pdf
    • http://files.namatkd.com/uploads/1/3/0/8/130814115/vukobizov-zijuxoluwof-nexugimofovirev-fuxitax.pdf
    • http://files.vto-org.com/uploads/1/3/1/6/131606677/2693949.pdf
    • http://files.paula-mcdermid.com/uploads/1/3/1/3/131397987/dosotunuradara-jopugit-tijazimunane-judiporago.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/8775813379.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/52984108801.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/46336067979.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwofejimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/73164651765.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/34573619983.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdf
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/puluzebiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/2743/7467/files/388543525.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9970/files/3151597804.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/redowa.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_off00006b5b.bin
cf8db29e6cd017d37f6df673740cee0f71438328096ef957dc0b1be44fd8c497
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5B 5152 bytes
font_01_sfnt_off00007d00.bin
c83b7766e2d97442bc3ea843d353b3ea71c0c6440db6c0516ad6d97d2fe22f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D00 13044 bytes