Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf493918429c7c0…

MALICIOUS

PDF

38.5 KB Created: 2020-09-02 14:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23925cce51b3d67e3e6156b971ff2269 SHA-1: 44cbcd51dfa06bc7b37fbd4d8a3f581369be670c SHA-256: bbf493918429c7c05fd68477fce8702badea5f8fed78e20f482c1e95be9eaa73
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body text, though heavily obfuscated, contains the string "Android one mode error" and references to wkhtmltopdf, suggesting a lure. The presence of a large number of embedded links, many pointing to Shopify, indicates a link farm strategy, likely to obscure the final malicious destination.

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/wix?keyword=android+one++mode+error
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/maseteminixezazotodelil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/loninepojalefaxofabewubil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2737/2964/files/silberberg_chemistry_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/psychodynamic_diagnostic_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/d_d_5e_online_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/kijanovobajerinelaxeruraz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/99561152162.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0305/files/74993648902.pdf
    • https://cdn.shopify.com/s/files/1/0458/3289/6675/files/8154919951.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0476/files/51047180390.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/amiodarona_farmacologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/highway_capacity_manual_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/lusimilikoxanogufanakad.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_off00005d3d.bin
eec7353dc6f45e30d1d1b2d7171b916d22f5824b260e7396219700b447b476c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3D 4540 bytes
font_01_sfnt_off00006c94.bin
1e71ea03ec6add67d5918316e7dd4a68aa4b0ac116b609abad93a66453f24101
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C94 9576 bytes