Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32fe7ce34be1dc6…

MALICIOUS

PDF

41.3 KB Created: 2020-08-17 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3961c31aedf278eed796b0c086a453fa SHA-1: a48221657da3e53be9d0c99b33d06baf667ad7b4 SHA-256: a32fe7ce34be1dc67eb2b3e0c0eb7b74946b72ef171d2f268cd99c91f3e864cc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link within the document, aiming to lure users to malicious content.

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.cc/pify?keyword=brusly+songs+free
    • http://befutu.gestaltequineinstitute.com/uploads/1/3/0/8/130813612/viwabasugefikesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/88311383535.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/rudekarevis.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/65181907774.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/charles_bukowski_post_office_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/bavemewobopumowagerebuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/like_us_ayo_and_teo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7887/7337/files/plural_of_cactus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/39678837218.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1998/files/malixufune.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/2629660728.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/devefepudiwamit.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_off00006140.bin
fc1b3fa2c7d7bf84d4ff3f983905d68891561576766b17194a4eda5d00037075
pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 4876 bytes
font_01_sfnt_off000071f6.bin
945bc3aa40e827ab3096b3546fd5c9c010c1e59bec79737a48698cf139001f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 12092 bytes