Malicious PDF — malware analysis report

Static analysis result for SHA-256 371499f740eece40…

MALICIOUS

PDF

41.6 KB Created: 2020-08-24 22:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 220b7be8bb8853af12967855eb6ebd91 SHA-1: 6fcdc7758f1f7126a0d7bb43c33d4ce8fbc9f169 SHA-256: 371499f740eece402a7887021f51eece26c4d078b41e5d69087b391faecf5be5
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which is likely intended to lead users to malicious content. The numerous embedded links in the PDF structure further support the attack pattern of directing users to external, potentially harmful, resources.

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=bottle+grotto+guide
    • http://files.glorybeehoneyfarm.com/uploads/1/3/1/6/131637108/4146641.pdf
    • http://files.harvestfarms.org/uploads/1/3/1/8/131872238/8543d97167d.pdf
    • http://zewamug.coloradospringsspaandsalon.com/uploads/1/3/0/9/130969723/4265142.pdf
    • http://files.thousandhillsstables.com/uploads/1/3/2/7/132710592/laxusunivazen.pdf
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/94480445456.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/jijitolelasamam.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/990922074.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/85486259055.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/wexatuzifivira.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3185/files/6061_aluminum_sheet_gauge.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/50034453105.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/wivurezusaromowabekimitu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/the_lottery_shirley_jackson.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_off000067a7.bin
891b445126c0193d58b577e0afd0083356f92a9fd1901ef1554e130e5557bfa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 4656 bytes
font_01_sfnt_off0000778e.bin
58dbf9045233c58e65e51b8b2d49bbf7f7559151cfce469863a0e69ac17a802c
pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 10068 bytes