Malicious PDF — malware analysis report

Static analysis result for SHA-256 a849039c7ebfd75f…

MALICIOUS

PDF

34.9 KB Created: 2020-08-29 14:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28301713b272e247ccd90b76a2fe894c SHA-1: 570047fc63d2ddf577516ba02475519aa45930e8 SHA-256: a849039c7ebfd75f17ad9b7c2e68c2150bd1e279faea1e205f582ad8fedfe7db
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=initiation+by+sylvia+plath+questions+and+answers'. Additionally, it exhibits a PDF SEO link farm behavior, with numerous links to Shopify-hosted PDFs. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on the malicious URL within the document.

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.me/wix?keyword=initiation+by+sylvia+plath+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0434/0219/9203/files/brahmanda_puranam_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/90587553825.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/rifekirelesejafusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/40426846318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/18379633197.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/lisitajesizaput.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/ravindra_jain_ramayan_songs_mp3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/marketing_digital_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/jolidudewipobifuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/nibco_butterfly_valves_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/vidmate_app_install_old.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/5976866617.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/define_cost_accounting.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_off00004b7c.bin
20f3d92e8f39cd322210e179ff337ae6f09f62efaf7fdb161168c3f8c5b35bec
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7C 5504 bytes
font_01_sfnt_off00005e33.bin
54ce3022a36ee1ace093fb23c12b2b0d8fd84ce8a9b2a9bb74e6240520aa1c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E33 9716 bytes