Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2c1a6b94085ebf…

MALICIOUS

PDF

45.4 KB Created: 2020-08-06 00:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d909c4d163b76951d8fcaf2d95fa00 SHA-1: 21569edf52cf65a60e6adaaf206def29e9925493 SHA-256: ba2c1a6b94085ebf91dd3c72be7f8b0c3e31ef24b48a85bffb5a04b39095a9ef
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily corrupted, contains text related to PDF conversion and the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a social engineering lure disguised as a helpful tool, redirecting users to malicious infrastructure.

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=convert+pdf+file+online+for+free
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • http://sunev.craftyphoenixscabin.co.uk/uploads/1/3/1/6/131607062/525f4.pdf
    • http://ruvij.myslovakiatour.com/uploads/1/3/1/8/131856725/8f156.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/dajalazotexelulux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/31796707553.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/lijudezunobitapikalelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/xomikodira.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/50417438077.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/75473856634.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/2567456237.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/39434189973.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/zosefug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/61317182314.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/romupatabigakomikugavek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/sabexopopofokiwutifosuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/xomunibez.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_off000067d1.bin
f21d0d48234e3b32cca2ab27373c142b56150db64d94150bb7ce785014fc3442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D1 4520 bytes
font_01_sfnt_off0000773f.bin
d14fb299685f7ec2aa95c92cbc4db609b5d7833802535013b0a4d79539ff9549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 10396 bytes
font_02_sfnt_off00009ac8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC8 4324 bytes

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