Malicious PDF — malware analysis report

Static analysis result for SHA-256 6766502e85883326…

MALICIOUS

PDF

73.9 KB Created: 2020-08-25 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e8d6b5047e74814c92e211f50102512 SHA-1: 11dd039e5e9a316afd186ac0adb2abe28f523080 SHA-256: 6766502e8588332653fb2245950082c847e661f453e53cf7d20654ae149a703f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL suggests an attempt to lead the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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=arcgis+network+dataset
    • http://files.abstractsbysabina.com/uploads/1/3/1/4/131437778/7691855.pdf
    • http://viwuguz.findingelect.org/uploads/1/3/0/8/130874493/2336351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8297/3345/files/the_knick_hdtv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0899/files/subomirapude.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/ragomogagowam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/32792856220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80170273674.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/matthieu_ricard_altruisme.pdf
    • https://cdn.shopify.com/s/files/1/0429/7549/4300/files/java_tutorial_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/pekexipexelixaxasajovejib.pdf
    • https://cdn.shopify.com/s/files/1/0437/3023/9637/files/80101571677.pdf
    • https://cdn.shopify.com/s/files/1/0459/9690/0511/files/tuwezugamajapeduvakikegu.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_off0000a031.bin
1180ceb74d8a0ccc8361a8b8bc75d6cd2b30ef38b39f01ab30b025b66cfe6807
pdf-font-stream PDF embedded font (sfnt) at offset 0xA031 20596 bytes
font_01_sfnt_off0000e12d.bin
4cb6546aa2c36e5d0ab346e900e21d644dd1ed1a1f793b77d754f1c7d204b77d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 5220 bytes
font_02_sfnt_off0000f30e.bin
338ca30a2ecb0e4eacb4f54e4a958e6c3e7fe8c67cfdba67ac4ca193b6601c16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 12224 bytes