Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f0311b2d5a623e…

MALICIOUS

PDF

40.1 KB Created: 2020-08-06 21:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11b285b67a078c1d4cedc6314293935a SHA-1: 69f860cab3c88fdb5cd5c1ad1ed7a700178a6174 SHA-256: c2f0311b2d5a623e09cfba2456a210722ce82eadde3a9b32f5aa5616d1b820d4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=common+mental+health+disorders+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=common+mental+health+disorders+pdf
    • http://files.mrscoopersblog.com/uploads/1/3/2/6/132680808/wumidol_bidujuji_korewosuxekuwe_wetabapufi.pdf
    • http://files.cjsquaredphotography.com/uploads/1/3/1/4/131453245/8b97d50.pdf
    • http://files.citygroves.com/uploads/1/3/0/7/130739978/9560233.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6370/files/volifefibedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9781/files/georgia_new_hire_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/gapiwunirikinuramodefifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/diwulowesimusag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/gesixorexuxegatin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/nvidia_shield_tv_specs.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/bobenawabogufisik.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_off000060ac.bin
918baaf68d0df39d298817714f0da87dcef88dd434da5e91154fb131856c7667
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AC 5188 bytes
font_01_sfnt_off00007217.bin
0000ca8cc5c089ac5ceef8558748ac42708bc70e185113637f02c5319be4195a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 9844 bytes