Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76b8e85499348fa…

MALICIOUS

PDF

44.7 KB Created: 2020-08-13 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361cb6a88f5d45ed23b8c665498ec66f SHA-1: 088ad792fca5e9b3dfd7e4163b1028eed0b8a98a SHA-256: c76b8e85499348fa3fcaf484bcc234fe08622a2bd3f387b73d91e59b06328e46
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, includes the same URL and a deceptive title related to 'Gta vice city cheat codes'. This suggests the primary purpose is to trick the user into visiting the malicious URL, likely to download and execute a further stage of malware. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=gta%20vice%20city%20cheat%20codes%20for%20swimming%20pdf
    • http://files.monaleighhome.com/uploads/1/3/1/3/131382141/majodumexa-didepem.pdf
    • http://files.angiesmithsphotos.com/uploads/1/3/1/0/131070469/kojid_wurenivizitej.pdf
    • http://bozagenu.yassermusa.com/uploads/1/3/1/4/131437987/wodulexatenajape.pdf
    • http://dimoguxaj.staustinsivybridge.co.uk/uploads/1/3/0/9/130969723/8d0ff1d3fe6c52.pdf
    • https://cdn.shopify.com/s/files/1/0449/1545/8215/files/new_delhi_metro_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/rifepuzikelopu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/nogafizasugimenuvenuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/gubamamulirunawemozekupex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/93970531616.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/31290918198.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/dutunawavexakoduledamum.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/59098067606.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/58326629726.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/ezviz_cs_cv310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kirojaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/73682124661.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/bohemian_rhapsody_guitar_solo_tab.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_off00006ea7.bin
5d59958160d81cb4bed72ca81bd6d25c00f6263b847260d97705fc6db4255923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 5820 bytes
font_01_sfnt_off0000827e.bin
76780dd8c6fdfbb8b10dfbf54459f92909fdffa27e2b5d3b564eec296a1ed395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 10376 bytes

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