Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dca77e88ad45b4…

MALICIOUS

PDF

45.0 KB Created: 2020-10-31 08:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f556650711888fd93ef4c4b7b5bb384c SHA-1: 59286a97795010470f26b645ab39e79aa4277c43 SHA-256: 71dca77e88ad45b4c480d0881ec653d2c0ad771e8bdc587527a27552902f019a
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the critical heuristic firing suggest the document's primary purpose is to facilitate a malicious redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/123?keyword=hillsborough+county+schools+teacher+calendar+2019
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/6011874.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/jibuxamol-nimaje-sitesemuj.pdf
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f96d71114883.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f9c99d340a55.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f8b5a7973a35.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5f954c547a390.pdf
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5f9bda8187554.pdf
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f9073ec3adb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21aa78d7-038e-48cf-85f2-5c494a1b1714/87036618625.pdf
    • https://cdn.shopify.com/s/files/1/0482/1788/2776/files/play_store_app_download_android_phone.pdf
    • https://uploads.strikinglycdn.com/files/a479ff29-33a3-437c-8326-2d9beca4bc2f/tivisubabatilumofobi.pdf
    • https://cdn.shopify.com/s/files/1/0495/9564/6101/files/aaos_spine_conditioning_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/bumefujixoxepizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/romaziwo.pdf
    • https://cdn.shopify.com/s/files/1/0484/0567/6192/files/sims_middle_school_teacher_arrested.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_off00006c44.bin
3263909512cddbc3a7697352488aff5956e42073f4c1df8b5b3eacb45a1fb4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 5888 bytes
font_01_sfnt_off00008046.bin
fb15188eb40c82aa58503bba1168f20bea384ba7ecf9ccee98399dba0cc81d38
pdf-font-stream PDF embedded font (sfnt) at offset 0x8046 11232 bytes