Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83fe1a8ed779fb7…

MALICIOUS

PDF

37.4 KB Created: 2020-08-30 06:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8830e7493b470cbe8a520f8f45ab943 SHA-1: d241b8e892cee7772148f46d76f102e3a544735a SHA-256: f83fe1a8ed779fb7deabac16a0d16a73e6ddc9eda29975199c08261425479657
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 containing a malicious redirector link. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is `https://ttraff.cc/wix?keyword=t%2525C3%2525BCrk%2525C3%2525A7e+tango+indir`, which is likely used to lure victims to a malicious site. The document body appears to be heavily obfuscated or corrupted, but the presence of this URL and the link farm structure strongly suggest a phishing or redirection attack.

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=t%2525C3%2525BCrk%2525C3%2525A7e+tango+indir
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/burhanuddin_moula_photos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/le_bourgeois_gentilhomme_english.pdf
    • https://static.usrfiles.com/ugd/b8c837_834f1ea47de1430fbb9741efb9b80c99.pdf
    • https://static.usrfiles.com/ugd/b8c837_452c173a275f48aab677c95e82945d25.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdacf10884604719b5fe5f97e6c3203c.pdf
    • https://static.usrfiles.com/ugd/de65f7_f438876db8554509a405996353ae4a92.pdf
    • https://static.usrfiles.com/ugd/b8c837_3760a391cc2b4da189a954bec98d68ea.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/23854591853.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/pressure_vessel_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/73236972134.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f9e4b0d3614ae69447528019b0ef3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://static.usrfiles.com/ugd/d78803_c20c20c61c56473e97941961ceff6a02.pdf
    • https://static.usrfiles.com/ugd/ae059d_5fe10f3825734a46829a40bf348548d2.pdf
    • https://static.usrfiles.com/ugd/89363e_690b3da41b4040eab1494503e62832de.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_off000052a6.bin
26ab569760c6404391cae947b6b8992d3a4d21ba21e0210b05b4287733bc3a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A6 5096 bytes
font_01_sfnt_off000063dc.bin
4a0c84b2b969c50961be342399098216def34848d3a38f5c7a300f74cd0a17cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DC 10784 bytes

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