Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1840dcb649f679…

MALICIOUS

PDF

33.8 KB Created: 2020-07-31 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09b994034e9fa67bb9e904f4c987b222 SHA-1: 8b6c3aaa4687e5809b075f7c383a3ad2fd71e96f SHA-256: ad1840dcb649f679feed861c827271f9a3b51413ffd4f52a9fea1b959f0e49bf
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, ttraff.cc, which is flagged as malicious. This redirector is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for the malicious content.

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.cc/pify?keyword=acca+manual+j+download+pdf
    • http://files.cragglaw.com/uploads/1/3/1/6/131606755/teduw.pdf
    • http://files.southfloridaboattours.com/uploads/1/3/1/6/131636866/acbf2e12c4.pdf
    • http://files.sola-boutique.com/uploads/1/3/0/9/130969728/xefafesisago.pdf
    • http://files.pennywinn.com/uploads/1/3/0/9/130970009/3316076.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/diwunipolaxubigu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/97410383351.pdf
    • https://cdn.shopify.com/s/files/1/0433/8889/5386/files/65401018042.pdf
    • https://cdn.shopify.com/s/files/1/0438/3368/8226/files/rufusurikoda.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/gozejejot.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3639/files/77240752439.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/59753790324.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/gipajeduduwosoxofanelifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/74063910867.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_off00004518.bin
d0a9dbc1b57724a88468ab56df7569743bb8309d06f7a9cb921a6434f61c68e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4518 5184 bytes
font_01_sfnt_off000056cb.bin
9c057184e93875e8a3fd4c91576a7c07b6f4ba84afc255a2ce1318dafad7e2c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x56CB 10504 bytes