Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8339f30ea2266f…

MALICIOUS

PDF

41.5 KB Created: 2020-08-23 08:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e71db591ef7b4e86a59eb1888f241f SHA-1: 55ef1f49481066bee7fb02649ca62e4da4a790a2 SHA-256: 4b8339f30ea2266f4f17315f5d3f4a67441f680b226f9ca9516e0cda537dd4a1
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=cissp+training+videos+2019'. The document body also contains this URL, suggesting a phishing lure related to training materials. The presence of numerous other links to Shopify domains, while marked as benign, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=cissp+training+videos+2019
    • http://titomezuf.lizhumestudio.com/uploads/1/3/1/8/131856166/276519.pdf
    • http://benufafi.ridgeandvalleyreptiles.com/uploads/1/3/2/6/132680835/d8e528.pdf
    • http://files.theaffairseries.com/uploads/1/3/1/4/131454034/2699731.pdf
    • http://files.centrocha.org/uploads/1/3/1/3/131383358/aeadd46eb398c3.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/principles_of_physics_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/xawumijilitadimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/nofinenumuvejizigapesere.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/happily_married_couples_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/3538/5243/files/88857008557.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/pygame_for_python_2._7_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pokemon_battle_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/practical_music_theory.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/fusionner_plusieurs_jpeg_en_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/xamaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/sisujuneribefibax.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/74624054368.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/17164311560.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_off000063ea.bin
f8fb54ea398d49ca48a16c5666452acf1abf07bd645adbbdc94462e50a2a1b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 5544 bytes
font_01_sfnt_off000076db.bin
3aab2f2d93414fe29e5ec07cb295aee536a53693080d24d0b5cd591a79385885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 10060 bytes

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