Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f65cc6b7fc7989a…

MALICIOUS

PDF

50.3 KB Created: 2020-07-22 06:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e91ee97b746e92353186cf63bba4f6 SHA-1: 3b52f7952b264e6d5dd5e42f4dd4a9f3712a6ab2 SHA-256: 0f65cc6b7fc7989af5aeb254fb71cd66e9da6dea58b7bd267e14209f41eb620e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'exam schedule', suggesting a lure. The presence of numerous external PDF links, many pointing to benign Shopify domains, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted, but the primary malicious activity observed is the redirection to a potentially harmful URL.

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.com/wb?keyword=bput%20exam%20schedule%202019%20pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • http://files.meredithlubowphd.com/uploads/1/3/1/3/131379343/757636.pdf
    • http://files.annualreport-m2016.com/uploads/1/3/2/6/132696018/misipasefirefazorude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/62292810486.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/1047035831.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/48171340193.pdf
    • https://xapapepukafu952058358.files.wordpress.com/2020/06/75064485915.pdf
    • https://boravitez.files.wordpress.com/2020/07/75846104768.pdf
    • https://miwexelak.files.wordpress.com/2020/07/64951485515.pdf
    • https://lemanesoneme.files.wordpress.com/2020/06/teponige.pdf
    • https://dozobozugut.files.wordpress.com/2020/06/36698131164.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/sezumaderiwanuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/levutum.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/90082099510.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/8173038030.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/pawerod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/91097476516.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/rajulipepudekopuneluke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/19707779345.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/tesipedakerabal.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c44.bin
1620410b0ab6af7cd4b95434dccb26b20831574618533af8dc6eeb14ea44de67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C44 5516 bytes
font_01_sfnt_off00008f1b.bin
7ca515efa3ef160144db5abe2b8e553c908a51fd86b8c8d8311ad0a550ce623f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 14292 bytes

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