Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e6d4ac9eb26d66…

MALICIOUS

PDF

38.0 KB Created: 2020-08-15 21:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 202bedf2c8c27c3ff1f6f8bc8b017c18 SHA-1: 56a76f2d683cd9e94cae09a8dd1530a98de35995 SHA-256: 98e6d4ac9eb26d66177476eb239cc26f29674648560f86cdbe8cd4b96fba65d1
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, including a suspicious one pointing to 'ttraff.ru', which is likely part of a phishing or malware distribution scheme. The presence of a large number of embedded links suggests an attempt to overwhelm or trick the user into clicking a malicious URL.

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=tex%20mex%20cookbook%20pdf
    • http://xojej.glenelgcp.com/uploads/1/3/1/3/131398140/jivupubijakenog-vubapomolaxar-kiledap-tokuxobagefama.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/free_corporate_meeting_minutes_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/difference_between_archaebacteria_and_eubacteria.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/70562272652.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/77796111308.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/world_war_hulk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4536/2591/files/nda_admit_card_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/58543304731.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/kewexuve.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/catechism_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/60498354674.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_off00005889.bin
e75e5c660877f96122270e0d9c4ad0c65cc685e6ea73a8469c519d1a852b8f07
pdf-font-stream PDF embedded font (sfnt) at offset 0x5889 5008 bytes
font_01_sfnt_off00006987.bin
6483215ec9a670978f75e9dc8bae16b7379debd6d6229ea85801d6e1100205c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6987 9996 bytes