Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc9b92b608d1d3…

MALICIOUS

PDF

43.0 KB Created: 2020-08-25 13:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4377937a71e52ef9d730742f7eb8703 SHA-1: dbe8375674635f864ede3f42895a7d0054639f20 SHA-256: 88bc9b92b608d1d304b2a07188de0113a0c1e0a0db78f43cd7a845ec9d5e99eb
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'https://ttraff.ru/pify?keyword=thyroid+ultrasound+report+meaning', suggesting a lure related to medical reports. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, some of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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=thyroid+ultrasound+report+meaning
    • http://medimam.virtualhomezone.com/uploads/1/3/1/8/131856543/jivowamego.pdf
    • http://files.aritonbaptist.org/uploads/1/3/1/4/131483069/tonalisonaxot_towejosulo_guwedozaxufeket.pdf
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/66960523173.pdf
    • https://cdn.shopify.com/s/files/1/0428/2512/1959/files/windows_7_ultimate_product_key.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/16729857698.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/incubus_are_you_in.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/vovuvosolus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2842/1528/files/fezefidakojuvajeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/fizepopusufujavewafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4794/files/95144266367.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/botelexoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/27006202829.pdf
    • https://cdn.shopify.com/s/files/1/0433/7854/0700/files/river_island_size_guide_dress.pdf
    • https://cdn.shopify.com/s/files/1/0437/0667/9447/files/21790630914.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d8d.bin
15029bdc9043514f818ebfd040ddf50e6ae923e4f07b1058fd0f447504042e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8D 5304 bytes
font_01_sfnt_off00006f6a.bin
cf1be7a3d3cbb85c46d70ade9a1fc17af311785a36f2e5f418a56dda599906b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 9984 bytes
font_02_sfnt_off00009157.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9157 4324 bytes