Malicious PDF — malware analysis report

Static analysis result for SHA-256 840d15adf90bcbb2…

MALICIOUS

PDF

49.6 KB Created: 2020-08-23 11:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb13d2274d3f872eebf3cd0c651bf2f SHA-1: 6c3c721c1c6e7542d34d13b889f080ec7ddebccf SHA-256: 840d15adf90bcbb28d4626a729332456fdc06a580d7246525513869db0ff6f84
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting the primary purpose is to lure users to external sites.

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=nj+attorney+general+guidelines+body+worn+cameras
    • http://files.portlandcommunitychorus.org/uploads/1/3/1/3/131382673/xojapulorenaroziz.pdf
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/4/131455956/puziwoxem.pdf
    • http://bizuvab.katasangkhae.com/uploads/1/3/1/8/131856005/xipajitekijiw.pdf
    • http://files.strictlyskillsbasketball.com/uploads/1/3/1/6/131636764/4217464.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/wazavapumakusefije.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/korawuzasogotuzije.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/pirerenikuluxonefexamul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/24916882673.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/understanding_life_science_grade_12_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2177/files/banefowola.pdf
    • https://cdn.shopify.com/s/files/1/0436/2482/4995/files/66548150386.pdf
    • https://cdn.shopify.com/s/files/1/0432/9567/0427/files/diruzotevepelotemi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0734/files/eu4_brandenburg_ideas_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3495/1331/files/define_aging_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/3726/8900/files/jefemufujaretobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/downloading_don_t_turn_off_target.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_off00007720.bin
a6623ee8ff1cd3fd1f945fec33ff6f9b2a628ab7667d76a2c4decc3019e5a966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7720 5520 bytes
font_01_sfnt_off000089e7.bin
05c52195e9c121824dac0e9337ac58c9ac9aafea3e5222fb2baf14f0a4ad46a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E7 9756 bytes
font_02_sfnt_off0000ab3e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3E 4324 bytes

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