Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f476f406a94ec93…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 05:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4be5a45ea34c66ee96d5e6fc74ee9b6 SHA-1: e0464667b40f395e7f997cd56851c9150887e860 SHA-256: 8f476f406a94ec931cceb5a92c4241fff0e2ccbffcba66bd6f90302f316204ac
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded URLs, many hosted on cdn.shopify.com, forming a link farm. The primary malicious URL is https://ttraff.cc/wix?keyword=uniforme+psg+2019+dls, which is likely used to redirect users to a malicious site. The ML classifier also strongly indicated maliciousness.

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=uniforme+psg+2019+dls
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/80921637418.pdf
    • https://cdn.shopify.com/s/files/1/0439/0879/2475/files/xonurozividurojej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/94443646509.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/hyper_terminal_for_window_7.pdf
    • https://static.usrfiles.com/ugd/0adedf_8f227c811ad443d5801e5ee9e36f6df9.pdf
    • https://static.usrfiles.com/ugd/b8c837_75478dc538074fe6bf2e28b0bf819761.pdf
    • https://static.usrfiles.com/ugd/7041e4_fc54778b68b24cc1be484de95eb5001c.pdf
    • https://static.usrfiles.com/ugd/625844_ed7685aec39140db8ed3f62f526c9e3d.pdf
    • https://static.usrfiles.com/ugd/735424_5a8054a45ac8470a99ee51aa4d2c8900.pdf
    • https://static.usrfiles.com/ugd/b8c837_992ee16689ec42778a78798ee7fe50aa.pdf
    • https://static.usrfiles.com/ugd/60933b_06b320f51b4d4a6e847414d57a7456a8.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/where_do_shield_volcanoes_form_plate_boundary.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/cupcake_bouquet_box_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/recetas_de_alimentacion_saludable.pdf
    • https://cdn.shopify.com/s/files/1/0436/6991/3753/files/reference_letter_template_for_school.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000562d.bin
7ae0195eace3799e1ced16681c1aeefb04624c2511b5e00680050c3d5d8a8595
pdf-font-stream PDF embedded font (sfnt) at offset 0x562D 5624 bytes
font_01_sfnt_off0000693b.bin
db69c4dba081d02df918935d645c343a41c9e2857757a1e0c6497b5ef108a354
pdf-font-stream PDF embedded font (sfnt) at offset 0x693B 15592 bytes