Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c09a5f6dae265a…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 18:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26900299108f84edafa778396800ba95 SHA-1: e4550add2e02683312b1b3aa88eb7e2186811404 SHA-256: 48c09a5f6dae265a4676965bb8c825745db762e05b823565098a17800801af75
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, suggesting an attempt to lure users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/wix?keyword=neat+polar+graphs
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/6639910689.pdf
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/adobe_acrobat_reader_dc_download_free_viewer_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/kaspersky_anti-_virus_free_trial.pdf
    • https://cdn.shopify.com/s/files/1/0462/6415/6314/files/80514733646.pdf
    • https://static.usrfiles.com/ugd/b58d21_3b918f7e52014fcda113c13e66a99db9.pdf
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f5df364077b4c2c9bb7c1e71aeafdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8341131268b34d49abf5fd162fc899af.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e295ca32214ca29ebc9d4ba87ce6b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f434805ddda4e75bd6a79c4399aa167.pdf
    • https://static.usrfiles.com/ugd/b8c837_a658ed13d6fa4681b9c578129c22c6a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e022dddd4185465698943bf8c13a8487.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36094868c549edb7d52b3539906ddd.pdf
    • https://static.usrfiles.com/ugd/63d3ad_0399c3fd262f43939bde44cbefe89ab4.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_off00005df0.bin
06843890f5f7aa5c94299b9ba41e485cbf1bd4b603f2f5a709bfd62f01d6b012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF0 5048 bytes
font_01_sfnt_off00006f15.bin
4bf598d295f45e880dfb780934825a5c6aa6bbb9732f9206d15d9610a91fb0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 10712 bytes
font_02_sfnt_off000093ed.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93ED 16036 bytes

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