Malicious PDF — malware analysis report

Static analysis result for SHA-256 b530462f61191dd9…

MALICIOUS

PDF

53.9 KB Created: 2020-08-10 15:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded507725c8fb79733d7e627bec121ac SHA-1: 82f450f5ec319f76b63c780fa885815246b005c4 SHA-256: b530462f61191dd92605dd3aecbbcf059e7b911e09f3c232f71d0669a33754aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though heavily obfuscated, contains a visible URL that appears to be a lure for educational worksheets. This suggests a phishing or social engineering attack aimed at redirecting users to malicious sites.

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=grade+2+math+fraction+worksheets+pdf
    • http://gijet.wendyscountrymarket.com/uploads/1/3/0/7/130776208/b1f36.pdf
    • http://fekutilak.maisyandlolarentals.com/uploads/1/3/1/6/131637814/sarapulux_wufataluwa.pdf
    • http://wamud.capitalcitycupsc.com/uploads/1/3/0/7/130738748/nitukavag_mujivuron_lugaxami.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/50772265222.pdf
    • https://cdn.shopify.com/s/files/1/0429/5688/2086/files/vapour_adsorption_refrigeration_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/suboduruzovinu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/93494322007.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/23028300381.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/vugagezetaduv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/27232002917.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7783/files/kawojizojanuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/31912445851.pdf
    • https://cdn.shopify.com/s/files/1/0453/5035/5099/files/cancer_de_pulmo_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/4128972864.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89352644259.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_off00009277.bin
3f63d5601387ba4ee7b22eb6a871444f7c3e96e9bd0a5c112496bcab5a9fd389
pdf-font-stream PDF embedded font (sfnt) at offset 0x9277 5684 bytes
font_01_sfnt_off0000a5c1.bin
04d9caa468b0ea7773fa3a5c7d85630bb502217033bfbfcc4aaa767ff1a15b18
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C1 10928 bytes