Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd4254cb106a58…

MALICIOUS

PDF

46.5 KB Created: 2020-08-17 18:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb47d86e3668e412ff9f0165c9254461 SHA-1: c08a3a54bf2fbd7bdc10fd1882b08fe6ff0b807c SHA-256: 8efd4254cb106a58e030d14f53d4b049734b9209ab8f00aa655afa63be647230
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to domains associated with link farms and redirectors, such as 'ttraff.ru'. The document body, though partially corrupted, includes the target URL and suggests a lure for a 'Bangla islamic book pdf file free'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of links to known malicious infrastructure. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=bangla+islamic+book+pdf+file+free
    • http://marurir.mathiasecology.com/uploads/1/3/0/8/130814328/vurananobilibamivom.pdf
    • http://files.brewablecafe.com/uploads/1/3/1/8/131871909/cced1.pdf
    • http://files.andrewmetzger.net/uploads/1/3/1/6/131606121/895d1291f8e68c4.pdf
    • http://files.townsonsmithdesign.com/uploads/1/3/2/8/132814343/bevupafef.pdf
    • http://files.theartofkatelynwood.com/uploads/1/3/0/7/130738870/fazuvilelu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/93481042850.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/fs_240.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/nugomafaweriditijufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/26653595638.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/56245830174.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4404/files/17621908483.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9590150980.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/muxojijozebisafix.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/53018038742.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/88084201546.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/1089738062.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/bobigirolo.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_off000069d0.bin
837f907d3249531456cf65670172172b9d92c6b20ec8bb8765832d40f0f3b556
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 5728 bytes
font_01_sfnt_off00007d2d.bin
c293238c1881e0ec5fde14f1f45b40cca78fe6fd163ba1bfcacbbda8ff983b87
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2D 14792 bytes