Malicious PDF — malware analysis report

Static analysis result for SHA-256 af74a29b7b980c7f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 03:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b758f125f9f9c62975f5e26d1dc458 SHA-1: f1d2ee8d8642919b5a27ccabaa11f25922fa712c SHA-256: af74a29b7b980c7f14d5a7895952b5a539d110da304ad585c62a4f25fde893ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.cc/wix?keyword=rca+colortrak+tv+manual'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, as indicated by PDF_SEO_LINK_FARM. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and link farm suggests a phishing or malware distribution attempt.

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=rca+colortrak+tv+manual
    • https://static.usrfiles.com/ugd/b8c837_40d955db258743aca8a77424d677199c.pdf
    • https://static.usrfiles.com/ugd/ab922d_7a442d3f93a5404ab49e4329fd71ec61.pdf
    • https://static.usrfiles.com/ugd/aff7ca_8f28bff33a474443a09c457ff3d387e0.pdf
    • https://static.usrfiles.com/ugd/b4a829_97942c10dee246a59c4dcd027f1c1cd2.pdf
    • https://static.usrfiles.com/ugd/bb13a2_6337114070b74c8a9135c98cc84a7d17.pdf
    • https://static.usrfiles.com/ugd/8c0e65_5e16d9b31a8a49098bed3f4ad35c8769.pdf
    • https://static.usrfiles.com/ugd/5b9a87_75c5707ed0cb470bb8876884169a5907.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/nyc_correctional_officer_exam.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/bsc_3rd_year_maths_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/2811/7661/files/zesijegagajorenawuvuzox.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1557/files/nuwunerepodufolegotije.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/56903244538.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c386b6eac7244b1864d68e86a4d93ad.pdf
    • https://static.usrfiles.com/ugd/ce14f3_dabe8fd9122d4f5bbd8a51436c862486.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d14305228349b79a9fa88ff53bf428.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_off00005809.bin
fee51c335a68a5bd131d98156384b419b31445e1a6de9c4363365524f9435c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 4616 bytes
font_01_sfnt_off0000679a.bin
6d2507c74e71dfce985ec90b873faa8cf0764eeb95ef95789b0cfd5ea9d9c7a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679A 10800 bytes
font_02_sfnt_off00008c51.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C51 4324 bytes

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