Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e936bb7cd6cac16…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000cd5709616b1a179ac66123f22abaa SHA-1: 3b76e94445d0959b07b371a8320b766259b0a297 SHA-256: 0e936bb7cd6cac16b4b5d6089e4d7bf757a9f549f37cafe894972d367cb35d6e
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic content, likely to encourage clicks on the malicious links. The ML classifier strongly indicates maliciousness, and the presence of a redirector link is a critical finding.

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=ib+diploma+business+management+pdf
    • http://files.savanfinancial.com/uploads/1/3/2/8/132815767/ad5bde.pdf
    • http://tojitewo.1stfabmc.com/uploads/1/3/1/0/131070115/juridi.pdf
    • http://files.camusicboosters.com/uploads/1/3/2/7/132712163/xonixiduxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/nogadixepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7860/6229/files/mojonogatapojikagelugixep.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/gidasepuvurajedurexikafi.pdf
    • https://cdn.shopify.com/s/files/1/0448/5870/4034/files/ct_scan_machine_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/xixemalegojotawikadije.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/solebogakefepi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/wisuwasekogubotifiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/guwatagav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/64857508252.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/the_miz_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/fanudole.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/vukufeniforo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ee3.bin
d85e6e770831f64ac793eb944bbd34b87e2ff1682a819ec267c22ebc5f5fe79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE3 5340 bytes
font_01_sfnt_off000080f9.bin
8037b8b1ccf87bfbe886218e300145cf4523908df715c88f7b77cf21a469a64c
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 10172 bytes