Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9240e19a9e751…

MALICIOUS

PDF

44.2 KB Created: 2020-07-14 13:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1883bd3f33ba54b508f7e85d48fda21c SHA-1: b0df2241615cbf143a7a68cde3adea968f9145c4 SHA-256: b6d9240e19a9e75156f506d98119804840a7e7d56739def409a7ceeac3c508ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier with high confidence and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. Another critical heuristic identifies a 'PDF_SEO_LINK_FARM' with many external PDF links, including one pointing to 'files.lotusdirect.co.uk'. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content beyond metadata.

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=libro+rojo+auditoria+interna+pdf
    • http://files.lotusdirect.co.uk/uploads/1/3/1/8/131871951/40a9d3ea055.pdf
    • http://files.nothernlotusayurveda.com/uploads/1/3/0/7/130739185/2628577.pdf
    • http://files.brainreachnorth.ca/uploads/1/3/0/9/130969986/3641528.pdf
    • http://files.bruinsyouthcheer.org/uploads/1/3/1/3/131379944/2cae5b.pdf
    • http://files.dr-chiropractic.co.uk/uploads/1/3/1/4/131408465/78eaa2c94dc1339.pdf
    • http://files.kanzcoffeecompany.com/uploads/1/3/1/4/131452811/3181818.pdf
    • http://files.oxfordhypnotherapyclinic.co.uk/uploads/1/3/0/9/130969775/zovise.pdf
    • http://files.beatlesliverpoolandmore.com/uploads/1/3/1/4/131437827/garixoduz_sejewewoxaniba_tenolezesile.pdf
    • http://files.beatlesliverpoolandmore.com/uploads/1/3/1/4/131437827
    • https://bezatib.files.wordpress.com/2020/06/73298591873.pdf
    • https://gigeseberi.files.wordpress.com/2020/07/68101851723.pdf
    • https://ravifaje.files.wordpress.com/2020/06/soxedobulezerusonujuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/71329089275.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/17824999191.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/jefuxap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.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_off00006e31.bin
7f8703351a505f51727005558b4ee79d5c62470b2969d16fa66a459b7bd58a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E31 4864 bytes
font_01_sfnt_off00007ebe.bin
e812c0b5d6e0ca8da6a822b0ea6a655f7edf26082be99fee774fd27190a983cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBE 10800 bytes

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