Malicious PDF — malware analysis report

Static analysis result for SHA-256 88233584fd69edc9…

MALICIOUS

PDF

52.3 KB Created: 2020-07-28 08:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84c116788a550ee9678f40526f76d24a SHA-1: bbdce6c81e6ae7eef62b2570e82bdf98a54028f0 SHA-256: 88233584fd69edc9864aaa9661aa5c320a3d5691b9c974161ad71949fd8d1ae9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the link farm and redirector are strong indicators 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.cc/pify?keyword=q+es+cuneiforme+diccionario
    • http://files.hartshillandharpfieldsra.org/uploads/1/3/0/7/130776150/1185917.pdf
    • http://files.santafevintage.com/uploads/1/3/1/6/131636737/pavuvesijofisi.pdf
    • http://files.sunnysidesymphony.org/uploads/1/3/0/8/130814666/kisigegis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/rajatupeto.pdf
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/36430491571.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7436/files/wixupenujikomuxelid.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/11631679683.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/releki.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/bifadozovejuduripilema.pdf
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/kadiviwotijugarovej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/52858627848.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8311/files/71920793896.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/bibinofutimagamotegid.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/24304717441.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/42475779951.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/89221416855.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007706.bin
2cd1ec056c1857fae06e2b8e7b7f103e92e0d76a95e59bbd0e80806c24493781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7706 4996 bytes
font_01_sfnt_off000087dd.bin
cbef1abb7800414a0073bd1b9b6fc31d6c4e569f33d392118b6939eca00d3b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DD 11348 bytes
font_02_sfnt_off0000ad15.bin
909e1284cb5cf330e420864cb10833f98e2764078d03bc4f2432c8e182b13f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD15 16200 bytes

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