Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da9e4cba08ba71c…

MALICIOUS

PDF

40.9 KB Created: 2020-07-22 12:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368fd840acc5710a2512055c64eeff93 SHA-1: 2488f3cc2cc8dce135cccb5c9b0602f3abb73716 SHA-256: 8da9e4cba08ba71c9eb0321261ab13fe13bc70c234e276c17d7a61d1821ae841
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful content through a network of links.

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=lasa%20drugs%20pdf
    • http://files.wirralepcs.com/uploads/1/3/2/6/132682833/moduxixivog.pdf
    • http://files.pamela-hanson.com/uploads/1/3/1/4/131437584/446590.pdf
    • http://files.brbestdressedball.com/uploads/1/3/0/8/130813841/woxopetapugarak_befiladefeneta.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/womakoxekumog.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/gebavowefavenop.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/nepelurefu.pdf
    • https://datilivi.files.wordpress.com/2020/07/fepamafupani.pdf
    • https://kedisufod.files.wordpress.com/2020/06/kaxegufavexusejimepimu.pdf
    • https://kanebefoge.files.wordpress.com/2020/06/78229870187.pdf
    • https://netigosod285927460.files.wordpress.com/2020/06/judoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/75543148718.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3221/files/vixosasibodusexef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/16441505120.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/sovixeninava.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/duxumosurazavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/dawepevuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/745169255.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://kanebefoge.files.wordpress.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006485.bin
1ba72072bddc0368c7d1f212523ee7bcba4b0360363db8e3873b8883cabf299c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6485 4536 bytes
font_01_sfnt_off000073f0.bin
2638b6ba8cef593583d4f2ca7f9d0f280da145a09d634f3c8781232c2bc51c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F0 10108 bytes