Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f961410721bef…

MALICIOUS

PDF

53.1 KB Created: 2020-08-25 04:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e57c76969ee2fbc9ebe579a916461eb SHA-1: de56b95778b3b79db97ba77fa250bc7972524138 SHA-256: db6f961410721bef833c137a775cb3947834d1b84bea8bb0cbcb0254970c4f2b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to download content. The presence of numerous other Shopify links indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=dhol+bhangra+beats+free
    • http://sidaxure.clevelandrelationshiptherapy.com/uploads/1/3/1/0/131070109/zapagibatasojedewoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/93951569073.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/33121203966.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/vofukomujofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/bigim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/jugukon.pdf
    • https://cdn.shopify.com/s/files/1/0464/6794/0504/files/body_transformation_from_yoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/80649162476.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/jasanoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1268/4967/files/duguwaxobupurotuxade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/alfabeto_braille_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/cancioneros_catolicos_con_acordes_para_guitarra.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083b6.bin
a3e52da46cca2875f10ee01ef9677bbe10a8dfbaf7c2eff7657a3620944d3518
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 4908 bytes
font_01_sfnt_off0000945c.bin
c6b6ab675ee3e9eb71dd397b006ec80c9f638ed2de6142085778347b0657018f
pdf-font-stream PDF embedded font (sfnt) at offset 0x945C 11448 bytes
font_02_sfnt_off0000b9d5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 4324 bytes