Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c21cf058d9e4ba…

MALICIOUS

PDF

39.3 KB Created: 2020-08-07 21:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 262d4d0bb34c1e4a68700c1c64ecf7be SHA-1: 7dfee039c1c0afa469d333523b6af1dd7acf8fc5 SHA-256: 97c21cf058d9e4ba8ae4c8f885ce056da4768186d8254bb57d4d0d6b40b52751
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure for a free PDF download, which aligns with the redirector's purpose. The ML classifier strongly indicates maliciousness, and the presence of multiple Shopify-hosted PDF links suggests a link farm for SEO manipulation to drive traffic to the malicious redirector.

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.com/pify?keyword=libro+de+armando+hoyos+pdf+gratis
    • http://files.teamupessentrics.com/uploads/1/3/1/6/131637839/mejulodu_fifibelumujim_fataferifekewe.pdf
    • http://files.pongdeelab.org/uploads/1/3/0/7/130775987/vubad_sogab_xiredatadevipoj_fuzisora.pdf
    • http://files.cmcasantaart.com/uploads/1/3/0/7/130739267/tokofuziridi-puwareb-makipuz.pdf
    • http://zawepu.robertodesignhouse.com/uploads/1/3/2/6/132681579/1c9511142.pdf
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/jisukuwuwamiziwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/povedepewavuzigiximatetek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/wozaloxiximunalawuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/bignoniaceae_family.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/satabelekeretukiborigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/3114851384.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4679/files/create_a_virtual_environment_python_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/southwest_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8947/files/35102907839.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/key_highlights_of_interim_budget_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/pepesogebabawafekebewumux.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_off00004b4d.bin
63dc7e88caf0ca96002235213d5d00c129db986d9bfd687fb52d23a799ea739b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4D 5392 bytes
font_01_sfnt_off00005d72.bin
b708a0a331d601bb68ac3b3f579b8a77f604fecd2a16fdf15a373f2947049a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 11052 bytes
font_02_sfnt_off000080b7.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B7 4324 bytes

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