Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f2221d41ba1a7c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-21 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12709113bf8287da838724b877924188 SHA-1: 0b859b6e2986f6b0497da7455ae50d4f48c6773e SHA-256: 72f2221d41ba1a7c0ae4386df6c6c8c0a787acf6603a2875fba11e55a2573115
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or hosting for malicious content. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including a known malicious redirector.

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=firefox+esr+52+32+bit
    • http://wovunetum.coldcreekangus.com/uploads/1/3/1/3/131378960/0ce1c5e046527fd.pdf
    • http://xuwipo.taylordesignarchitects.com/uploads/1/3/0/8/130874493/2232213.pdf
    • http://files.t9corp.com/uploads/1/3/0/7/130775201/loxupazopij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/arduino_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/nikon_d5600_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/bojilemos.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6957/files/29463063658.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/6265161135.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/fadivuwogozewezag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8516/0857/files/jubovojaletebesineta.pdf
    • https://cdn.shopify.com/s/files/1/0462/9449/9489/files/le_banquier_livre.pdf
    • https://cdn.shopify.com/s/files/1/0436/7872/8345/files/organizational_chart_template_excel_2010.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/77275108318.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aed.bin
d45bd374c0af5911c6a0ecb84958835ec0d870e642869f75f89706b183135d46
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AED 5388 bytes
font_01_sfnt_off00006d3e.bin
cfa0003ec269b8e691fc2de97a21c81bdaf058dd0599db0744d6dbb5ab606e01
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3E 5104 bytes
font_02_sfnt_off00007eba.bin
60f11e395087a746a37475bebd12c8749d3a0a122c24d46d70e62a7e12da0ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBA 10648 bytes