Malicious PDF — malware analysis report

Static analysis result for SHA-256 256cbd73977a7f05…

MALICIOUS

PDF

45.4 KB Created: 2020-08-07 07:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3b18880652be9753cce1dd5753d0db SHA-1: be0a8cb024c406d68e6dfc36a7a16c2764207652 SHA-256: 256cbd73977a7f05eed04849ab5dba78da5de4a255f2b0e6a958f01655129bac
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution site.

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=bundled+tube+structure+pdf
    • http://files.pocketfulproductions.com/uploads/1/3/2/6/132695986/679ded.pdf
    • http://files.buscogoodnews.com/uploads/1/3/0/7/130775712/ligozudotero_votosarip_wexejovamimumoz_rebikokoxebi.pdf
    • http://ponoz.visionillustration.com/uploads/1/3/1/3/131383314/sakajot-sifufozezojutev-jazas-lewewutu.pdf
    • http://linodimut.choldertonwilts.org.uk/uploads/1/3/2/7/132712323/71b0f4f1c.pdf
    • http://files.lacrl.org/uploads/1/3/1/4/131483361/borigap_libegakuxu_totarusewoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/81352779814.pdf
    • https://cdn.shopify.com/s/files/1/0434/8585/5897/files/astral_projection_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/29158648052.pdf
    • https://cdn.shopify.com/s/files/1/0430/2582/5955/files/notafafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/17469367534.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/wubenulalolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/tirubigidatam.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/30338624286.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/nebupudijokigameze.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0552/files/2331686401.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/mivirowuwobuwuzepofer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/13510147306.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92588710477.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_off000074cd.bin
564e574c7616081e9d0cbbfa0e4ccf803119961825ff57cecb9449e43ea24873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5128 bytes
font_01_sfnt_off0000864e.bin
3cc6e39f88a3a8c4d2ac26db664aded74f7a91a2211416d836486b7b6a3ddf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 9984 bytes

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