Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79860d52d15487…

MALICIOUS

PDF

58.4 KB Created: 2020-08-12 06:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd257ef2b155cecc3088903ed058a8de SHA-1: 36dcd233061cdea253da6cf488b9fae1b2184748 SHA-256: 1f79860d52d1548735ddca2f0b2cdecc02931f30f758193b15ae0c82cba9ef0a
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning or a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics confirm a link-based attack pattern.

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=themen%20aktuell%201%20bilingual%20workbook%20pdf
    • http://wakekuj.oldlakewoodshop.com/uploads/1/3/2/8/132814930/5fb76.pdf
    • http://files.satchelcafe.com/uploads/1/3/2/3/132302858/pukifodarubud_bamujob_fotelarutele.pdf
    • http://files.laviishluxxe.com/uploads/1/3/0/7/130775942/1a41a3f.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/kupekiwezar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/gisolonakuwetuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/56041689969.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/cazadora_de_hadas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/cracking_toefl_ibt_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/89225470776.pdf
    • https://cdn.shopify.com/s/files/1/0443/0325/3660/files/world_map_black_and_white_with_country_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/zosijefapixiduxiju.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/41952333351.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499a.bin
1fbc185976f3acfdad25ea679797a4e02dfcf536a1c3715c6c8b035422b0a3e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x499A 30576 bytes
font_01_sfnt_off0000a606.bin
8f749c5766f3108bff63d513da2cbdeb638392c4df6bb35e4657db94627d0a92
pdf-font-stream PDF embedded font (sfnt) at offset 0xA606 5572 bytes
font_02_sfnt_off0000b8e3.bin
36d3e2ce15027ac2269d930ed6bf66f0f8800718ece398f272c7b8079e2931ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 10648 bytes