Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb0c236fb24d49d…

MALICIOUS

PDF

34.3 KB Created: 2020-08-05 05:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b98bfd5bf5904fbad8047608a026a105 SHA-1: 480b6793e3ab58c5280018eb9a67a3ea2e70cd4f SHA-256: 0fb0c236fb24d49dcfc220d2f7cc4d6ef2a1ed8665c560a01f65aaea6352dfe4
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominently leading to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a callback lure heuristic suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains the primary malicious URL, indicating an attempt to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=jaiib+accounting+and+finance+for+bankers+short+notes+pdf
    • http://files.rmtzgarcia.com/uploads/1/3/1/6/131636745/kipodarosemav.pdf
    • http://files.kawsaycenterperu.org/uploads/1/3/2/6/132696263/tijaze_pigoviseji.pdf
    • http://torap.tspcapa.org/uploads/1/3/1/8/131856725/belozol_xowenaviwajoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/74861348924.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/mupuvujevolisofosol.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/wojupemakora.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9487/files/99088129337.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/pezidewujidivalata.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/kodolebadasiluluzokev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/94557862467.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/beletotogozuxop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/98860375605.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/bowflex_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8685957786.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_off00004742.bin
0c0a35cfce2c70501bf43cc629773d256bf517ac002dacac10cdc98577d1531c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4742 5576 bytes
font_01_sfnt_off00005a36.bin
31c8faf50334aab4ae70f3972412dd6f2ae69081f44e3fdece7b41d4d080014b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A36 9964 bytes

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