Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4c361ebf4be7f2…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 12:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8763b1342cdb686e0342fcda8ce533b SHA-1: 8d971c493d81de2611c4e994a95885f37f8449e1 SHA-256: 2c4c361ebf4be7f26254661a6bf79bcfacaa7f78197106331b3dc71a485f84ed
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, `https://ttraff.link/wix?keyword=free+download+adobe+reader+10+full+v`, which is designed to lure users into downloading malicious software by impersonating a legitimate software download. The document body and embedded links further support this by referencing 'free download adobe reader' and providing numerous links to PDF files hosted on Shopify, likely part of a link farm to improve SEO for malicious download sites. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=free+download+adobe+reader+10+full+v
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/19639584665.pdf
    • https://cdn.shopify.com/s/files/1/0430/2956/1495/files/zabedet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/nukigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/pinuvofobasunalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/i_love_to_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/xesuxemelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/dr_chung_s_sat_math_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/9102273041.pdf
    • https://cdn.shopify.com/s/files/1/0459/6341/1616/files/harry_potter_first_movie_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/55792996107.pdf
    • https://cdn.shopify.com/s/files/1/0428/3626/3078/files/antivirus_for_laptop_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1782/files/jolofezepugawelidiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/arduino_uno_simple_projects.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/asean_summit_2020.pdf
    • https://cdn.shopify.com/s/files/1/0447/8219/0749/files/bogan_full_movie_hd_video_tamil.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_off00006555.bin
b0726f6c2f2d9ebca271ad930e130206348b438eee09b09054d481f3f0e40f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 5164 bytes
font_01_sfnt_off00007714.bin
df94dfeeda4bb443b883097eb9edadf2223289aa8e186a48555769857f835b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10064 bytes

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