Malicious PDF — malware analysis report

Static analysis result for SHA-256 9062b38e32cbe918…

MALICIOUS

PDF

55.5 KB Created: 2020-08-10 22:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3244e0e1549af643d54923226d9feba6 SHA-1: 16b57f3b56e89149a12517e4ac834e438b1b4671 SHA-256: 9062b38e32cbe91840be5e0ee353391a006ba8ac9986cd62e8514c7f7215c91f
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be the primary lure, pointing to 'bsc agriculture 1st semester books pdf', which redirects through a malicious domain.

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=bsc+agriculture+1st+semester+books+pdf
    • http://wokirenal.ipodmeister.com/uploads/1/3/1/4/131453574/af947fe8dc.pdf
    • http://kogefek.boshistandardpoodles.net/uploads/1/3/0/8/130873995/aa8f43de1892955.pdf
    • http://files.balsamrootcatering.com/uploads/1/3/1/4/131453823/62a591f91cd.pdf
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/ielts_writing_task_2_samples_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/79307659386.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/rabasig.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/celtic_gods_and_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9333/5970/files/41677127690.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/bilemokusezuforibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/65163692101.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/jevavufinarajala.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/ashrae_refrigeration_handbook_1998.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/48942446479.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/69678833659.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/55316031998.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8424/files/fusugowelekepuboruzetosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/quicksilver_throttle_control_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/galipe.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0c.bin
1da8120dfa6e58dace33a5dbd832f9f056c4d292ddf8e1c1c90e2908d8359423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0C 5780 bytes
font_01_sfnt_off00007f9f.bin
55deeea3a93518db721a97da0d8f9359fab86ec4add728a48e55287c41c27800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9F 3204 bytes
font_02_sfnt_off00008c8f.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8F 2320 bytes
font_03_sfnt_off000096df.bin
341bbe5f8310db02e98596da5992cdd17392aa08c2a7fe4df3bcb686adb58ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DF 10368 bytes
font_04_sfnt_off0000ba4a.bin
5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4A 16224 bytes

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