Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa49b80b832892f5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-13 17:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69ed06961e9be3537b8be09a3a3d619 SHA-1: 0069ee2e156f31fc914ff2fc29d21fd43e6f010d SHA-256: aa49b80b832892f57ab6380e0d694cdaa8577d1502380538d111cb1c723e2d8f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary URL pointing to a redirector associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the link structure is the primary indicator of malicious intent.

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/wb?keyword=partitive%20proportion%20worksheet%20grade%206
    • http://files.inkwellretreats.org/uploads/1/3/1/4/131453494/bekodezoj.pdf
    • http://gozor.vagabondgeology.com/uploads/1/3/0/7/130739090/nawetiligofes_wusak_vuzufurukejaj.pdf
    • http://files.myhackney.org/uploads/1/3/0/8/130814387/dutisonejoxigonerizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/18034928855.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42262915950.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/lalunijavilufimoses.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/building_information_modeling_a_strategic_implementation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5276/8151/files/libro_el_cerebro_humano.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/75224584590.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/pogeburukokoletena.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/fejibivemixinulede.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/pro_and_cons_topics.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/fire_emblem_path_of_radiance_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/60968428671.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_off0000659e.bin
a2aa65e339bc66b8ad698c50e893c1bb78065276427831ee5d524f493c582ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659E 5560 bytes
font_01_sfnt_off00007893.bin
9a81b21c992ee62314cf6aa313bfb6f3e1a33e3bf9d330cdcb3b2997debb520b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7893 12076 bytes
font_02_sfnt_off0000a0dd.bin
6ff35bbcdef839a823e086214e5d609f702bf6b4484614f6c4b824d32b7fcc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 16204 bytes

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