Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c2a159b8b4e88…

MALICIOUS

PDF

39.5 KB Created: 2020-08-15 03:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc0045347e57fd111c53261536c4b4f6 SHA-1: d38c6dcb346e52fd18a7baea30e3c53f6cb9aa2e SHA-256: 836c2a159b8b4e88ed9510cd6702efb585f6d1bccbe43c2c233043d867caa2b0
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to 'manual handling training' and the malicious URL, suggesting a lure. The presence of a link farm heuristic indicates an attempt to generate traffic or distribute malicious content. The ML classifier also 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.ru/wb?keyword=manual%20handling%20training%20adelaide%20sa
    • http://kefofubox.cantortradegroup.com/uploads/1/3/2/6/132682076/pozigat_gelozakavitub.pdf
    • http://files.tommysguitars.com/uploads/1/3/2/6/132695213/8cc78c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3088/0162/files/budurizejaliwakeze.pdf
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/39048597844.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/modern_periodic_table_of_elements_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/78283663198.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/mewijobekimefus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/33614048105.pdf
    • https://cdn.shopify.com/s/files/1/0432/5208/9000/files/nalek.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/different_types_of_discourse_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/22422345991.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/42019672084.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/e-_business_strategy.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_off00005c87.bin
34c89d23ea3ead133d5859a608c7975100056cae2a8b670fb391e089741c4822
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C87 5092 bytes
font_01_sfnt_off00006dc5.bin
ef3b0098cbf46b65c6c40867b7146e25b71bc7176d91ff87ef142bb7c3023e60
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 10432 bytes