Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d381dd34b355d6…

MALICIOUS

PDF

50.9 KB Created: 2020-08-30 12:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d8f8f1f4be2082ddc2e3c943a5f2a9 SHA-1: aac36cef18d5b0d31f375392dd26eadc87bf9719 SHA-256: d9d381dd34b355d6ac319eb4ddf2cef6487422d16c13ace1094c6b79ba98c0df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=darkest+dungeon+blueprint', suggesting a lure related to the game 'Darkest Dungeon'. The presence of numerous benign-looking PDF links hosted on Shopify indicates an attempt to blend malicious infrastructure with legitimate content. 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.cc/wix?keyword=darkest+dungeon+blueprint
    • https://static.usrfiles.com/ugd/432b07_6435c35f5bac4baabc31697fd9d78137.pdf
    • https://static.usrfiles.com/ugd/b8c837_e04cfbe82eb043ddbcb5868b31569016.pdf
    • https://static.usrfiles.com/ugd/3bf302_cd914fa49150459d94dd30ef5528b8e6.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/wugusu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/76203693007.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/lutav.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/mibeluga.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/95267869896.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/56340933769.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/tenajevozuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1536/files/aula_internacional_1_libro_profesor.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/3131886935.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b32.bin
44243104d53fe27eac3e27f516dce9176a6ea59f1fd343d472ad5ab2bcae5895
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B32 5328 bytes
font_01_sfnt_off00007d50.bin
0f85c486f754e88a63bcc70db87186824cdda289e926c68e1288a2bb44c55b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D50 1644 bytes
font_02_sfnt_off000085ae.bin
4589698a5c94f6711242693d7f277337c7ac4388d991cf5e374890435ec14c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x85AE 10348 bytes
font_03_sfnt_off0000a95f.bin
7a021fca60ecd63275c5ac415a522ab2557a9ab5314ad652b8c52077bc6aedd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA95F 16096 bytes