Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a256b800c01982…

MALICIOUS

PDF

58.1 KB Created: 2020-08-14 22:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c2be8ea6f428abd0a72588d220a267d SHA-1: 993180d452980443b6007003f234679c4dd37959 SHA-256: c7a256b800c01982a3e755841df930bfe45354e06a0b2d454681179bfed0e32c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, characteristic of a link farm, with a primary redirector identified at ttraff.ru. This infrastructure is used to lure users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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=character+study+of+moses+pdf
    • http://wixad.cftrainingservices.com/uploads/1/3/1/0/131071164/b0ce8958.pdf
    • https://cdn.shopify.com/s/files/1/0436/0067/4978/files/vugareduwibubifumatija.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/xowuj.pdf
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/css_box_sizing.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2722/files/schistosomiasis_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/xuwenixoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/wuwuwoditoniwabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/57883899100.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/socialism_capitalism_and_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/jokegufozenax.pdf
    • https://cdn.shopify.com/s/files/1/0437/2076/9685/files/linear_and_nonlinear_functional_analysis_with_applications.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0445/9102/2244/files/37936346242.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_off00008d4a.bin
4482880a4bbe5ed29fcd7bf9743c0b7d53c501c121576c974caa3d89b4b1d45c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 5368 bytes
font_01_sfnt_off00009f6f.bin
a73d51a52e3dbeff3c2dc11c5eefb9465bfb03803e9e9aa93c75def009f18687
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6F 10612 bytes
font_02_sfnt_off0000c40d.bin
c3716ef5d4bb1603cf7473d56d9770c27ae3424f24ffe223ebd590198783faeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 16836 bytes