Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4380c86e2ad9d97…

MALICIOUS

PDF

49.3 KB Created: 2020-08-19 10:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361335f14b8dbd2c2acd92e950aa3592 SHA-1: b3baaac04c7863e7adf77b636a61be0630347280 SHA-256: f4380c86e2ad9d976923f6ca640b09fcd9273aa7bd1f2704407fa5a2d20ca2e4
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDF files. One of the embedded URLs, https://ttraff.ru/pify?keyword=plastic+laminate+sheets+thickness, is identified as a known malicious redirector. The document body contains garbled text but also includes the same URL and several Shopify-hosted PDF links, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the sheer volume of links and the identified malicious redirector indicate a high likelihood of malicious intent, possibly to redirect users to phishing or malware hosting sites.

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=plastic+laminate+sheets+thickness
    • http://mimov.austinhighseniors.com/uploads/1/3/2/7/132712050/vutebavubawubi.pdf
    • http://files.elinatinsky.com/uploads/1/3/1/3/131380625/zevevugoniletad-baramag.pdf
    • http://nosunajab.marcelastrasdas.com/uploads/1/3/1/4/131437532/b29f5bb4b1f9a.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/ap_sakshi_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/dewalt_dw705_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/xufefegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/88133292548.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4179/files/buwejobexemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/40895075940.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/circuit_maker_2020_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/7977/8979/files/wasewili.pdf
    • https://cdn.shopify.com/s/files/1/0437/8843/5613/files/15426670339.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5978/files/jexutuxasidefotitu.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_off00008463.bin
e544cf311bc69a2fb88593105b422f2522247c2e066b1fa1792e90f6f4e29ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8463 5008 bytes
font_01_sfnt_off00009539.bin
80549544aef8fa03006c1d5f19d6c6fa47d097427e08d952346955488b4a047e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9539 10352 bytes