Malicious PDF — malware analysis report

Static analysis result for SHA-256 14baf7a05fd41ffc…

MALICIOUS

PDF

50.7 KB Created: 2020-08-04 06:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c825c5105f5bae69e7334a91369056b8 SHA-1: fd69cbd6fd4aaab3231bcba97bc42488c7946872 SHA-256: 14baf7a05fd41ffcddaaa4d5b6cae635a1df767a45fc1e50eee224c74f1fe4d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector infrastructure, indicating a malicious intent to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=italic+calligraphy+alphabet+pdf
    • http://files.climatologylab.org/uploads/1/3/1/3/131378838/xaturov-rowikatogojija-mulozenekev-lizadid.pdf
    • http://files.nevadadiscoveryride.com/uploads/1/3/1/3/131381540/dorojede.pdf
    • http://files.justinedaisuke.com/uploads/1/3/2/6/132696598/4872712.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/72904400989.pdf
    • https://cdn.shopify.com/s/files/1/0440/7833/4117/files/14995756954.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/125_best_gluten_free_bread_machine_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/ncoer_training_bullets.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/java_parse_string.pdf
    • https://cdn.shopify.com/s/files/1/0444/4153/4631/files/i_17_to_flagstaff_road_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/32591800220.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/walker_physics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6540/1753/files/49250299027.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7508/files/fifelomizur.pdf
    • https://cdn.shopify.com/s/files/1/0430/4204/6103/files/kikijelixoxixesojed.pdf
    • https://cdn.shopify.com/s/files/1/0433/7185/6026/files/21331846861.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/mbstu_admission_2020_20.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d06.bin
2a542a2a2fbd2a948840507faf6a673d2fbdcd68a94211637735c62887d1fcc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D06 4988 bytes
font_01_sfnt_off00008e0a.bin
6dd21b7305f938340069cc49f72bb2bc2a05ed6647b71b8ddf012bc44e99a722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 9896 bytes
font_02_sfnt_off0000afdc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 4324 bytes

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