Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9efbced38038c0…

MALICIOUS

PDF

47.3 KB Created: 2020-08-09 19:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3a71acb9212fb87cb6d3afab7b7acf SHA-1: 305e9c8cd58e11db3cda11652a5305e86c1a60c7 SHA-256: eb9efbced38038c0787810457d76fd3c4f6ffd4ee9c9aef598b21a10a5f159fe
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=catalogo+hinode+em+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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=catalogo+hinode+em+pdf
    • http://files.northpenninewools.org/uploads/1/3/0/8/130813528/dcbd9b57a2.pdf
    • http://files.incrediblehampi.org/uploads/1/3/1/6/131636990/a091ba9871a35.pdf
    • http://files.nzrallycars.co.nz/uploads/1/3/1/4/131438784/zijonaj.pdf
    • http://files.bromleyfriendsforum.org/uploads/1/3/1/4/131437276/cdb51aa9705.pdf
    • http://fufirosox.coloradomineralandfossilshows.com/uploads/1/3/1/0/131070590/6710511.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/32610489305.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0485/files/18199471856.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/la_cantatrice_chauve_telecharger.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/zomilokukelem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/94129581128.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/foods_high_in_vitamin_b12.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/25604844682.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/calculus_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5493/files/23293310554.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/javascript_string_to_number.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/wugotaxewamolif.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_off00006a3d.bin
4a3ee81e9e70835f0f18e457ac0bb479d4f84b131f1af2185c24703b5177f818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 4992 bytes
font_01_sfnt_off00007b0b.bin
12c930ca76bc8c54d71cded716898c650492aebe7c18fd2678fb432d068a6689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 11972 bytes
font_02_sfnt_off0000a1cb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CB 4324 bytes

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