Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4539044f2458e8…

MALICIOUS

PDF

38.0 KB Created: 2020-09-18 11:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22850e2510e85fa0cf515f1325bd590e SHA-1: d3c2d90ea2341d8a5b435424d79382726c98d73c SHA-256: 7c4539044f2458e8ff7ad39e5622a935cfab4ea747cd5dbc23c66b9c00f91d28
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure and a large number of other PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malware or phish users. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of an attack.

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.club/wix?keyword=witchery+fume+funnel
    • http://nejepuri.streetfleamarket.net/uploads/1/3/0/7/130738531/vawobesuradu.pdf
    • http://xowemevi.spanglishtc.com/uploads/1/3/1/1/131164250/a3f9ce.pdf
    • http://files.luxaeternasolar.com/uploads/1/3/1/4/131437778/zewinotur.pdf
    • http://files.shannonbibby.com/uploads/1/3/2/6/132681443/bilirax-muzezezugoleji.pdf
    • http://files.mitchellhabitat.org/uploads/1/3/1/8/131857390/8010547.pdf
    • http://paxiweb.poniesandfire.com/uploads/1/3/2/6/132683438/wofixufi-betek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/54218024681.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/81478341312.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7879/files/wegibaxakowirug.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/fish_animated_wallpaper_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/free_visiting_card_psd_templates.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/fogogavusokuzotetap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/berlin_metro_map_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005883.bin
1bca23422e27c88817be774568818b1cae7b1648c13dbe727a6c420668bd17a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 4848 bytes
font_01_sfnt_off000068ec.bin
ea83c767f9a01015498da9802da5302f772318233afc440c1fc3a6a437607e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 10176 bytes