Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb022d16adbcd23b…

MALICIOUS

PDF

52.3 KB Created: 2020-08-08 06:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27af9a442f05893f5929a443423515d7 SHA-1: 10e642bef19b533ce8fb4c74fb8e14f61b7c31a1 SHA-256: bb022d16adbcd23ba7da341b447037aeccbe4bde1679593472cbf6e2c03f8977
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to a known malicious redirector, 'ttraff.ru', which is likely used to obscure the final destination. Another heuristic identified a link farm pointing to external PDFs, many hosted on Shopify, suggesting a potential SEO poisoning or link-farming scheme. The document body, though heavily obfuscated, contains the redirector URL and several Shopify-hosted PDF links.

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=linux+shell+scripting+tutorial+with+examples+pdf
    • http://kixozis.cranewyork.com/uploads/1/3/0/7/130776644/xapikizidezazomemap.pdf
    • http://kesikex.richgoodson.com/uploads/1/3/0/9/130969754/4350993.pdf
    • http://vadesoja.admcclub.com/uploads/1/3/0/9/130969352/waremu_ruzologojuk_rafimode_manofa.pdf
    • http://files.greenwichinternationalpreschoolkinder.com/uploads/1/3/1/4/131437064/baritoxasaliminoli.pdf
    • http://files.fendragonsandmore.com/uploads/1/3/1/3/131379639/jexuzebegom-xunaman-lemot.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/zozuxulibadijemizisewuli.pdf
    • https://cdn.shopify.com/s/files/1/0438/6874/9979/files/loxudukudapaxuraf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/15093660610.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/9093102143.pdf
    • https://cdn.shopify.com/s/files/1/0450/5364/0856/files/guitar_hero_drum_set.pdf
    • https://cdn.shopify.com/s/files/1/0445/1673/7183/files/dusuvamivetokibifojutewoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/miwizutovuka.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/3345426107.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/9117714027.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/argan_el_arte_moderno.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/jojudog.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/cub_cadet_1040.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2578/files/nowulamosupafivakokewu.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_off00007fc4.bin
19fa2c77cc294d27a7392db22e031f146a1258f67fce79069bf58696fdfed649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC4 5668 bytes
font_01_sfnt_off00009301.bin
a3e031affc88164ac2b7d9ab10095ecfe8c5151909f981195cccf147402886c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 15516 bytes

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