Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bbfb6eaf759f06…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d38d5262971fdc52bd4b562f41ba6305 SHA-1: 2766ba93570a1270a14748ff7ee22058a2e48f60 SHA-256: a3bbfb6eaf759f06ade27914423a1c312a92606120cbc37d5c9e2c7c9b831e0e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=vitamin+sources+and+functions+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The document body, though partially corrupted, contains the same URL, reinforcing the lure. The primary intent appears to be redirecting users to malicious infrastructure for further exploitation.

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=vitamin+sources+and+functions+worksheet
    • http://files.alterraocean.com/uploads/1/3/2/6/132682806/zakigi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0581/1608/files/kevojafegerozatanotuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5190/8249/files/12056172001.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/61650208908.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/rizikizolobizotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/31796707553.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/smart_tv_powered_by_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/teboga.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/zibelebuduviwojudujekupa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/kefulepoluvab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/15867353662.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_off00005eea.bin
ec792256e5cb86f1da6f49a81ae36d0848b43de91eb953c437b84e35c60261f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEA 5352 bytes
font_01_sfnt_off00007103.bin
978fa0461a4aa749ba7874138ab52fdde3afae418e226ba0cdcd5c0b56a2c627
pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 10520 bytes