Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc016c3f8b55890…

MALICIOUS

PDF

51.1 KB Created: 2020-08-17 01:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4dac951ea8ed3f06f290b001204ac13 SHA-1: bac223912fbda271b9a8c358118fbe8abcdb7194 SHA-256: 9bc016c3f8b55890cac7a57e9ac3ecd5641378db80a405a95421b925ba09d70c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=knowledge+matters+merchandising+math+quiz+answers
    • http://files.mermaidraina.com/uploads/1/3/1/8/131858540/gefurujapebonu-vekazubixu-xigotaf.pdf
    • http://vumuxod.hiddenplayground.org/uploads/1/3/1/1/131164574/fuzekugagapex.pdf
    • http://miset.addingtonforge.com/uploads/1/3/1/4/131407921/3983852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0248/6180/files/mulekevife.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/4704749865.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/javeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4195/files/denujuledujugukur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2974/9147/files/79562775988.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/approaches_in_teaching_social_studies.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/33513685227.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/tadozutelasatasebewu.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_off00008703.bin
0b78061bcea18076db7f7df2d3ee56d26a1bb16f65a7853f4336cb084b3fcef4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8703 5592 bytes
font_01_sfnt_off000099e8.bin
f1ca03116fcf1d1f9805aa0b60328262aba2a9f488c04b24840f247511ff1793
pdf-font-stream PDF embedded font (sfnt) at offset 0x99E8 11036 bytes