Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab13c9b8d6479575…

MALICIOUS

PDF

67.1 KB Created: 2020-08-23 01:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb65bc135502eb8df6a89d82d8800419 SHA-1: 4431eae9bf0c7eecdcc5e0719005c386ee98b709 SHA-256: ab13c9b8d6479575344c2389feff244c61e424c9ec5f5b0f7a3d349b829c12f9
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious URL identified is ttraff.ru, which likely serves as a redirector to further malicious content. The document body itself is largely obfuscated but contains the same URLs found in the heuristics.

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=bilinear+transformation+low+pass+filter+example
    • http://damov.tilleyrent.com/uploads/1/3/0/7/130738850/9547366.pdf
    • http://files.luckywin-autoparts.com/uploads/1/3/0/8/130874535/8274424.pdf
    • http://files.amazingoliveoil.com/uploads/1/3/0/8/130874490/lobologegula.pdf
    • http://files.brookekferguson.com/uploads/1/3/1/3/131383456/xavitefa_retibonik.pdf
    • https://cdn.shopify.com/s/files/1/0439/9408/7582/files/lubarilovefezexilisoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/66571620184.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/86283196182.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/51961445953.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/72069100166.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/carbon_copy_cloner_free_mac.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/lagexodetal.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/beletirisemixodojes.pdf
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/assembly_language_programming_made_clear_a_systematic_approach.pdf
    • https://cdn.shopify.com/s/files/1/0462/7261/0455/files/88309951729.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_off0000ad5e.bin
c35bfa4a0b997a0e0d9b63acecfd6bb4693cf9018286d6c3ee3f90c3650962e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 5044 bytes
font_01_sfnt_off0000be6b.bin
1904542b49e08721144f93cf5b71fe3dbaf5f0f500f2d35d83a4ce6e74738301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16416 bytes
font_02_sfnt_off0000f162.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 4324 bytes

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