Malicious PDF — malware analysis report

Static analysis result for SHA-256 20744402f8553f6c…

MALICIOUS

PDF

44.9 KB Created: 2020-07-30 18:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea5078eb33909e4537f6d6e763875f9 SHA-1: 71d00c79dfd97b42d31a535d6832b559c8063f38 SHA-256: 20744402f8553f6cac3d5e3d0a6f1d90ad49b580ca15036a4e7678942129ced5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is a redirector that appears to be used for distributing malicious content or phishing lures. While the document body is heavily obfuscated, the presence of numerous links and the specific redirector URL strongly suggest a malicious intent, likely related to a phishing or malware distribution campaign.

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.cc/pify?keyword=endometritis+cr%25C3%25B3nica+inespec%25C3%25ADfica+pdf
    • http://files.alphabetspeechtherapy.co.uk/uploads/1/3/0/7/130776267/zasidesaf.pdf
    • http://files.intowishinarts.com/uploads/1/3/0/7/130775286/rosaf.pdf
    • http://files.angieskonacoffee.com/uploads/1/3/2/6/132681617/funux-marajize-duzebawik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/61560518484.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/gadivawerowovake.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/97517384910.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/61477949177.pdf
    • https://cdn.shopify.com/s/files/1/0440/1666/4734/files/17985215062.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/joredejozobowevato.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/jivoxazi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7558/2617/files/zubiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/wubemomuraredalowup.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/72166302413.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/rubivokuxesilun.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f09.bin
c6d0194ac08c6aee43d547f6776c6086a4f18df3d83e87d25c6191f7388fa824
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F09 5204 bytes
font_01_sfnt_off00008059.bin
a0764b1993fc66acd5b26169af68eccaa210c4bc20ce35f32a160b3836e82138
pdf-font-stream PDF embedded font (sfnt) at offset 0x8059 11052 bytes