Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39d178cf060696b…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 02:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3fc4303061b3f5e0b738b89a17e158 SHA-1: 8370ceb042054fc6a574eab9905d1b019d00b3b9 SHA-256: d39d178cf060696b88d097c13c10f8ee0a39e6b853c38354e12ff60f222a3aed
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify-hosted PDFs. One URL, 'https://ttraff.ru/wb?keyword=atomy%20company%20introduction%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or corrupted, but the presence of the malicious redirector and the link farm suggests a lure or SEO manipulation tactic.

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=atomy%20company%20introduction%20pdf
    • http://files.losslessimagery.com/uploads/1/3/1/4/131411542/dopezovusoj.pdf
    • http://files.awesomepawsacademy.com/uploads/1/3/1/4/131453109/gozosawigew.pdf
    • http://files.westerncanineacademy.ca/uploads/1/3/1/3/131383664/lobop.pdf
    • http://files.coastalphotoclub.com/uploads/1/3/1/1/131163564/8046763.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/sepokejuwofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/free_printable_food_diary_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7546/9473/files/fizuvanunabarapen.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/12997564967.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2161/files/55907078985.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4570/files/jovorivirigizemivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/bukode.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/beginner_level_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/89376117119.pdf
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/automatic_car_driving_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/mawarixelozebalisodow.pdf
    • https://cdn.shopify.com/s/files/1/0435/9172/9309/files/balance_sheet_analysis_and_credit_appraisal_for_bankers.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_off00006143.bin
480ee727d767b5d0250762c6d7d90ddf0eae7abe8e17c6c3b11316df825e8f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 3076 bytes
font_01_sfnt_off00006c40.bin
058d705f2d3d0d7da502f5cce63a7ca3fe0643643e7dce8c9f5412000880c8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 5184 bytes
font_02_sfnt_off00007dd3.bin
6439de4249cb6ffd5bf1bf8ce9bbf7835f4ec4d8694d87dd136a86ae88b7297a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 10536 bytes

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