Malicious PDF — malware analysis report

Static analysis result for SHA-256 7147b9ee05ca9b2e…

MALICIOUS

PDF

51.2 KB Created: 2020-07-28 16:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810db54698df17d42a15061999f78e45 SHA-1: 512da6578db5682d8c606694d8270c18f9e3538d SHA-256: 7147b9ee05ca9b2e52982887eb07761d5a2b8e5f6f1ac982a5e37f03004dd42e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, appears to be a lure related to 'Fleischner guidelines 2017 nodules'. The presence of a malicious redirector link and a link farm suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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=fleischner+guidelines+2017+nodules
    • http://files.schoolorchardsafrica.org/uploads/1/3/0/7/130739564/5316578.pdf
    • http://files.tierrasantajuniorwomens.org/uploads/1/3/2/6/132695200/kamotazesun.pdf
    • http://files.vancouver-landscaping.com/uploads/1/3/1/4/131453799/5409301.pdf
    • http://files.pittsburghighschoolband.org/uploads/1/3/1/8/131871488/famawazaxikad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/datozimibobemodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/linonanagonatalozuviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/fopajumowedusiwovanujo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1125/files/36930899895.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/10083196197.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/96976937838.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/wuvesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/tidefudif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/77002609425.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/6261473316.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/83114089971.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/4071833832.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/86239402186.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f6d.bin
51318fb60be3c600ad1682139d56c2c93839ce09ce75943f2df16431fda5f0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6D 5152 bytes
font_01_sfnt_off000090e3.bin
5fe0b483c67f33066f007ab6c0fee57af906572fb708abe4d98fcaefc6413b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E3 15020 bytes

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