Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84136b2fbc19b0d…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3099a99a34d6644c67cba3b1da48a2e7 SHA-1: 8cbacca46ca500341caaa8598d29802122866fed SHA-256: e84136b2fbc19b0dd4954826f10a585617d414e31e55aeb2f60382684a1a3e1e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a high number of embedded links, many pointing to external PDFs. One URL, https://ttraff.ru/pify?keyword=yoga+mantra+music+free, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or redirection scheme. No scripts were extracted, limiting the analysis of direct payload delivery.

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=yoga+mantra+music+free
    • http://nigeru.sandersontrailerstx.com/uploads/1/3/0/7/130740265/sinikiporu_zemevetu_momate.pdf
    • https://cdn.shopify.com/s/files/1/0434/5092/5223/files/zomilekivot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/business_plan_sample_for_small_restaurant.pdf
    • https://cdn.shopify.com/s/files/1/0431/5044/2652/files/12427889563.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/wigapopaselukaroximew.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/64624069440.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/pefovadewinalifozikelite.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/61690254324.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/caribbean_islands_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/kavasosoworefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/mojejikobofizuwiropa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1791/files/55961596555.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/movomozoleritawabiveposob.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_off0000694b.bin
70c31c1d172eb78de19ebcd6113d70d70390186b339ea7812629abcb63e4cbf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x694B 5128 bytes
font_01_sfnt_off00007aa7.bin
15b84446ce8adfdf747e89a7c772b897e0c94062a4e5a5b26fe5c4c707af7bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 15136 bytes