Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e775913b543e279…

MALICIOUS

PDF

41.0 KB Created: 2020-08-07 04:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb8e1d772e5c96d36f6066163dd8b2b SHA-1: 5225f601605d4756bce7aa57062faa0ce597c78c SHA-256: 9e775913b543e2798e0d3ac5640ad178661c3b498a3a83c7b48c28f56bfc3105
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download a sociology book PDF, which is a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

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=sociology+book+class+11+pdf
    • http://files.poplarbluffdancestudio.com/uploads/1/3/2/6/132695472/5281392.pdf
    • http://files.estatecomputers.net/uploads/1/3/1/4/131437599/papasuvejubikeb_vediruwun.pdf
    • http://xuvexo.newlifesocal.org/uploads/1/3/0/8/130813528/54544cb7b260ce1.pdf
    • http://files.votelogan53.com/uploads/1/3/0/7/130776152/kunobolamivum-rixozuvi-laposot-zotavogubewepin.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5255/files/97648683760.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/legijukodulexaxade.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/47850297646.pdf
    • https://cdn.shopify.com/s/files/1/0437/2489/8453/files/59344588120.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/webiteguvosoranesupof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/ruxifowovukumu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/48412661623.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_off00006068.bin
15b099fcd92e1337e87e6f3895625ddf6a4726159336c4bef4e2fe6ea76de998
pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5688 bytes
font_01_sfnt_off000073ee.bin
100432f4fa83307bd325f3f4ef1b3e3d21d9810ccb100626493d6675202e21aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 10388 bytes