Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ce83787276a7aa…

MALICIOUS

PDF

46.1 KB Created: 2020-07-29 22:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba5fb5931482fe54bdb083c0515b5a50 SHA-1: 77265c862501b6d11d7684d30a42703d57bd7420 SHA-256: 62ce83787276a7aa40dfcf4687c23c6e96b4b56ab56525c456bcc7cbe92ed6a5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm behavior, embedding numerous external links, many of which are benign Shopify URLs but one points to the same malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content, but the presence of a password-protected archive lure heuristic suggests an attempt to conceal a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=administracion+de+recursos+humanos+bohlander+17+edicion+pdf
    • http://files.totalstationsstore.com/uploads/1/3/2/3/132303163/6848148.pdf
    • http://files.merwininsurance.net/uploads/1/3/1/4/131453068/xuruvibi.pdf
    • http://files.a-pathwaytopeace.com/uploads/1/3/1/3/131398141/lafevokon.pdf
    • http://files.katiegmitchell.com/uploads/1/3/0/7/130775867/9284372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/tokuranosojemavinawukir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/pavalikozuvopebuwaxap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/11339751633.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/sevavip.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/17039788616.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gubiwunezekubukezo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1400/files/42119039710.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/63287595413.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/jojerudipululozetejuketa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070ad.bin
db2cd6f6d90dd0e88929d1efb08b7bc398c2145c5371b242baceb331d8360818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AD 5540 bytes
font_01_sfnt_off0000834b.bin
49def1fbfd83022a9296683d15ddca5eee7e92df7b04a3ec7182ef7ba3ffeb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 11544 bytes

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