Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab0a83672eb99ee…

MALICIOUS

PDF

38.3 KB Created: 2020-08-22 17:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d00411dac18c0db8b2684abb4f063d8 SHA-1: b785d791de9a432b145a9471bd6311b55d4ebbbf SHA-256: 9ab0a83672eb99ee91d37b50fcedac799e00bd63037b57e838973fb303a82722
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of external links. One of these links points to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious traffic. The document body contains garbled text but also includes the malicious URL and several Shopify-hosted PDF links, suggesting a link farm or redirection strategy.

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=berthold+city+bold+font
    • http://files.wokingminiaturerailwaysociety.com/uploads/1/3/1/6/131606111/xavigubifimenew-nikibowujatur.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/5354167237.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/30518730821.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/32622821574.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/anatomia_topografica_de_cabeza_y_cuello.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/duzixerazomovirosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/39974826643.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/fotogiralugebunulubakuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8074/files/mokexemunefatatamelalikoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/37881698941.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/mantenimiento_de_elevadores_de_cangilones.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_off0000427e.bin
a0b5f0463360c0dc79ba7d31defce05b848c8bdcee9eafa158c88ba6b564b51e
pdf-font-stream PDF embedded font (sfnt) at offset 0x427E 5012 bytes
font_01_sfnt_off00005381.bin
40492ffb4da5bc4af5c76ccc8812b1f230467a3a9ea24ae79e460374057a9ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5381 8232 bytes
font_02_sfnt_off00006a6d.bin
e60d686c9277e3ae81b5e02241eb2fb30353266f998174d94a246cf2ce5701ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6D 9876 bytes