Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad944ee73f92339…

MALICIOUS

PDF

55.2 KB Created: 2020-08-09 01:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 712910d7b6f9061128d6e6ecc53fef35 SHA-1: f76511e709ae491d3324b640db80c3f66ab37be1 SHA-256: 7ad944ee73f923390f698214111535041d32fce4a1877b9ff19923255258bc61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to look like a textbook download. This URL, 'https://ttraff.cc/pify?keyword=hornbill+english+textbook+class+11+pdf', is the primary indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded links to PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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=hornbill+english+textbook+class+11+pdf
    • http://files.cana1.com/uploads/1/3/1/3/131384407/tabubewuje.pdf
    • http://files.thesavvywineshopper.com/uploads/1/3/1/3/131384679/nejijufagupoma_dupaw.pdf
    • http://files.tensilegroupinc.com/uploads/1/3/0/7/130775607/jiwamenaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/1431/4405/files/86033952043.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/dupapowupoteg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/end_warmup_csgo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/zimof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/89706964968.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/d._o._c_marocain.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21883700101.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/ditogefudojamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/7365026390.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/54910387666.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/23579348130.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5819/files/tracheostomy_care_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/pudas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/gewufovukuxeramivawam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b34.bin
3a9af2116f8f01c582d6145d825bfe40926faab923a5f300e085b56bcf7b5910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B34 5492 bytes
font_01_sfnt_off00009dd6.bin
43d699f9505b712a722972dbb2a3b7b2526045b271008b7a01082f3ffaa07bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD6 10368 bytes
font_02_sfnt_off0000c110.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 4324 bytes

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