Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5fdf27002c6e29…

MALICIOUS

PDF

41.8 KB Created: 2020-08-17 18:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aadeb7b28cdd58d6b6ff0f01fb5b5ee4 SHA-1: 13e77c4599daa955c92e3e2865b05c27af3100d9 SHA-256: 6f5fdf27002c6e29ca8d14e8c7f42227ba6832f6637e7b89a4d8a7c77ba94a9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though obfuscated, also contains the primary malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

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/pify?keyword=empire+total+war+strategy+guide+united+provinces
    • http://files.wheredreamscometruefor.com/uploads/1/3/2/8/132814898/reviwonoj_vifipin_mikananezivavap.pdf
    • http://files.newcastlememorialarena.com/uploads/1/3/2/7/132740804/5323256.pdf
    • http://files.twistleguild.org/uploads/1/3/0/7/130776567/638b7df5d6c21.pdf
    • http://files.historicinnskennebunkport.com/uploads/1/3/0/7/130739142/364597.pdf
    • http://files.dynamicgas.com/uploads/1/3/0/8/130874009/pozonozusuvere_zilosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/three_states_of_matter_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/72324311244.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/13388799722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/82552031954.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/fundamental_accounting_principles_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7249/files/26053429314.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/szckte_yap_konu_anlatm.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/anima_weapon_ff14.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/ca_final_costing_paduka.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fd.bin
bb8ad236574f36ae0880d5d90a8e13de3ea42132ac80ee1c36cc6c59b5e976ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 5604 bytes
font_01_sfnt_off00007809.bin
4b5afaeb85be68acf284eec65036f9b73db2aa83e9fd6ced85d85f67599a0546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7809 9956 bytes

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