Malicious PDF — malware analysis report

Static analysis result for SHA-256 90171df13ec93ed7…

MALICIOUS

PDF

71.3 KB Created: 2020-08-20 09:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c16bfd8083b906977bec99d8435851 SHA-1: 085317ad3a8a1ad68787f435cd59f8dc33e51a24 SHA-256: 90171df13ec93ed72ab3574ae471d8860ade330c1299c78a378e9e258587bf47
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm heuristic, with the primary link leading to a Shopify domain. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'Archer c7 v5.0 firmware' and the malicious URL, suggesting a lure to a malicious site disguised as firmware information.

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.
  • 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.
  • 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.com/pify?keyword=archer+c7+v5.+0+firmware
    • http://luzenak.nmffa.org/uploads/1/3/1/6/131606289/1358809.pdf
    • http://fubosu.findingtiffany.com/uploads/1/3/1/4/131454106/kukupuwonazude.pdf
    • http://files.aallformsoflife.com/uploads/1/3/0/7/130775299/2485230.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/zupiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/9257191404.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/ssc_stenographer_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/state_of_blockchain_q1_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/20943000283.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/rawofimetawixevifok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/22328113550.pdf
    • https://cdn.shopify.com/s/files/1/0462/8407/9264/files/lower_back_exercises_for_pain_relief.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/enfold_theme_custom_post_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/7_wonders_of_the_world_ppt.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_off0000c929.bin
ad3f3a3b3e55be4a73ad07634093d5e2da1af2828c4bcd6ddf2b1559879fdf6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 5432 bytes
font_01_sfnt_off0000dba7.bin
43852af4abb9af0dba219a4c15a887dae66b982c7cab24aa28cab83e5ff78cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 17472 bytes

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