Malicious PDF — malware analysis report

Static analysis result for SHA-256 838cc73c382f49e4…

MALICIOUS

PDF

48.2 KB Created: 2020-07-25 19:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3004998de8cb9f001c20a614795e963c SHA-1: 6214a0d3a89b49e11d3a0009413aac139040f7c6 SHA-256: 838cc73c382f49e4e696506f777aada084624c6d3a149e152fb16d05a14de15c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another noted a large external PDF link farm. The document body appears to be obfuscated or corrupted, providing no clear textual lure. The primary attack pattern involves directing users to malicious sites through these embedded 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.cc/pify?keyword=android+bottom+sheet+animation
    • http://files.in2uceremonies.com/uploads/1/3/1/3/131398268/33ac1262fc.pdf
    • http://files.thebeloitphilosopher.com/uploads/1/3/0/8/130873958/cc3e8364.pdf
    • http://files.gillysplaceinkefalonia.co.uk/uploads/1/3/0/8/130813667/3983028.pdf
    • http://files.centroppsf.com/uploads/1/3/1/4/131483281/0889737b80f35f.pdf
    • http://files.4bardworkingdogs.com/uploads/1/3/2/6/132681150/zojif-pekerasus.pdf
    • https://cdn.shopify.com/s/files/1/0435/0273/1430/files/67056036907.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/repipamumemeputu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/warumuxexixovevudukage.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/22545392912.pdf
    • https://cdn.shopify.com/s/files/1/0429/8460/3801/files/42858343507.pdf
    • https://cdn.shopify.com/s/files/1/0433/4695/2351/files/7391394383.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/vubotera.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/78416307521.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/83062731345.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/
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/warumuxexi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b11.bin
f42a2c1bdd7af0f72823862338cc5687cc0086e0febc1ba12cc663f718bbeaf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 4948 bytes
font_01_sfnt_off00008ba2.bin
a99d20b423c817a757ebb7154e8e5a4cbe1110aeec8bb86bb2e5c1dffc6cfb6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA2 12440 bytes