Malicious PDF — malware analysis report

Static analysis result for SHA-256 7524973266fe651f…

MALICIOUS

PDF

50.3 KB Created: 2020-08-18 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9be1a69e7bf42557537f608659562eab SHA-1: 0313ced6cbbf210e4c00400d087a3d6ad10ac18a SHA-256: 7524973266fe651fbd505cca427090bea8b8f67a636eefedda45d3c57637a261
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 suspicious or unknown domains, indicating a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other potentially benign-looking but numerous external links.

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=aatma+tamil+movie+songs
    • http://vozuwemiv.emmanuellebeautysalon-spa.com/uploads/1/3/1/4/131437987/jafenoberowak.pdf
    • http://fewusak.wicksitslit.com/uploads/1/3/1/8/131857334/pebudadewamage-sosuserupegi-jelirimexuz-tubuvosarad.pdf
    • http://files.koepplinkicking.com/uploads/1/3/1/8/131871730/4abaaf8ce6ff.pdf
    • http://files.nathanddavis.com/uploads/1/3/1/6/131637308/fb8a64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/airtel_tv_apk_for_mi_tv.pdf
    • https://cdn.shopify.com/s/files/1/0446/5616/5027/files/number_format_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/buremujepesavukewajid.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/ditavafibagudo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7075/8820/files/58425566005.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/laxonoketulogowogiwupam.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/skyrim_nudity_mod.pdf
    • https://cdn.shopify.com/s/files/1/0454/4541/5070/files/bailey_and_love_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9409/8598/files/56490242660.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/soxeforobagep.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/16403356787.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e67.bin
3931ff2d3da29ffdd0d1e35b3b4f5886f445fa9df85b062a6cf5d307176084af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E67 4960 bytes
font_01_sfnt_off00008f41.bin
70267384a7b183a3215384125c4c0b489cc69dad2f63b3b8d95ffba4f820ed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F41 14528 bytes

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