Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d6104238e354b6…

MALICIOUS

PDF

48.8 KB Created: 2020-07-26 03:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25abdda8762da808b1eb1078e19e23af SHA-1: fbcf7cc30608e6df1903c56814b96fc9c4c75376 SHA-256: b3d6104238e354b64d597aa50e65425fb708937bb44d3ea33cf8f7d06203bf39
154 Risk Score

Malware Insights

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

The PDF file contains a link farm strategy, embedding numerous links to external PDFs, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a keyword related to organizational diagnostics, likely as a lure. The ML classifier strongly indicates maliciousness.

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=modelos%20del%20diagnostico%20organizacional%20pdf
    • http://files.babasvegancafe.com/uploads/1/3/0/8/130874066/xogovonodexuwepodu.pdf
    • http://files.bigbellceramics.com/uploads/1/3/2/8/132814086/6227204.pdf
    • http://files.questaerialsolutions.com/uploads/1/3/1/0/131070841/76e362f7d6dc043.pdf
    • http://files.questaeria
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/tuzolugusoloxefomafipala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8216/2084/files/jugonuvetosofozoni.pdf
    • https://cdn.shopify.com/s/files/1/0440/4379/6645/files/bexasixogenekerikititajod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/42074304156.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/bajamexuboxujesir.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/menoludig.pdf
    • https://cdn.shopify.com/s/files/1/0435/4326/5434/files/65546264482.pdf
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/83730350912.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/lifupixilovivew.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/76578693552.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/xolebukoradofupibubas.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/17185123582.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/nixudosukifekaz.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_off00007e2d.bin
f611d726394ad9dc6277603fb822c2ebacc085cf88e72042ef6ba9239df4ceca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2D 5168 bytes
font_01_sfnt_off00008fdb.bin
fa94ae4d46d833a0782cbcbe86d86b230a2d5dba842c8c6005084c83113b01c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDB 11060 bytes