Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3243c3faaede2b…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 16:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d2549128f63277140656d74104bf76d SHA-1: eee571517cd8ebba86af84cdb2b1f215a28f3644 SHA-256: bb3243c3faaede2b5760375f219042e8a5ab14e2c02ede2739ba0218e0571dc0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented in the document body with a karaoke-themed keyword, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to funnel users to a malicious 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=boney+m+rivers+of+babylon+karaoke
    • http://files.babybluebeebunnies.com/uploads/1/3/1/4/131438190/tarivelava.pdf
    • http://nodaruvit.cjcbigband.org/uploads/1/3/1/6/131636744/dipewobiveba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/12042553013.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/69346994147.pdf
    • https://cdn.shopify.com/s/files/1/0434/1628/9442/files/44846873947.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/xisusululeketakeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/dijelowojuvusogajalupoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/wusidu.pdf
    • https://cdn.shopify.com/s/files/1/0458/2421/3155/files/baldi_s_basics_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/57577647910.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0441/0497/4488/files/berlin_u_bahn_s_bahn_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/29254704674.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/10059264240.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/thinkbook_13s.pdf
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/nedoruxariboturikomoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/88464604693.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea6.bin
11cd8324ef01e50e178e4cb0ed501dc108fc625831a5585b2d3eada0bcff0274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA6 5036 bytes
font_01_sfnt_off00005fa6.bin
fe66f8380c1339209f37c61a4aa8b4656559a2861a3f20538317640d97705ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 10204 bytes
font_02_sfnt_off000082a1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 4324 bytes

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