Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec47cb39e9efe88d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-02 12:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8aa61328f1cce158e09bb48f74f0af SHA-1: 8cd780f14a9e71423219a5fec79216a5dbf6a19f SHA-256: ec47cb39e9efe88dd8387608f584f19f2144a44782eb4491faaf0cd2e5e6589a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=pdf%20auditing%20arens. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=pdf%20auditing%20arens
    • http://files.minty-moon.com/uploads/1/3/0/7/130776521/4926850.pdf
    • http://files.sudbrinkacademy.com/uploads/1/3/1/4/131482832/zekojoreribu-japopulexo-rowazuzoro.pdf
    • http://files.bluffsidebirdie.com/uploads/1/3/1/4/131454316/nokelugivolib-jugeminadi-bevelitelaxew-totabamekegi.pdf
    • http://files.dragomirdogs.com/uploads/1/3/2/7/132741181/38d53e64c.pdf
    • http://files.willowfree.ca/uploads/1/3/0/7/130740344/xiwodufa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/98923097995.pdf
    • https://cdn.shopify.com/s/files/1/0428/8993/7055/files/printable_calendar_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/8374860471.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/17126730440.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/duwufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/89728531629.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/lebewadawir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/milig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31184917419.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/mikilemafapoze.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/pdf_to_dxf_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/43242149811.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/98192114245.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_off000063eb.bin
4d51265028a6d524b581bc60b38aef325bcc99c447436d493b9334274653a901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 5044 bytes
font_01_sfnt_off00007529.bin
39d59ec76185df8318d60479631ab871a97febd2b05643533aba12cebf4d6109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7529 10352 bytes

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