Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a8c7f1a12c7ab5…

MALICIOUS

PDF

51.0 KB Created: 2020-08-18 16:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b994e4e7d5e2335f0b53cf307b2f61 SHA-1: d36087c5f655d7e9ca0977b217f98ed63595c407 SHA-256: 65a8c7f1a12c7ab5d6f261ec69f364f9126ca54b2a3c3622ea6fee95b3e8d878
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicated 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=arya+2+movie+song+malayalam
    • http://files.zaidiecooper.com/uploads/1/3/2/7/132740511/7639881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7536/1178/files/xajujoxopeviwuwabarilase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/audi_0-_60_times.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9616/files/18184745330.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/bupawusikixesuxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/any_to_dwg_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3363/files/bluestone_alley_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/on_duplicate_key_update.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/openscad_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0445/7247/5556/files/xumomuvubikawobufivajuzew.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/fivugasiwig.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074e4.bin
b521a697381ed4863f3c50dd9ed6836482a82874c555ae02eeb8b7bfbd2b74f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E4 5288 bytes
font_01_sfnt_off000086d8.bin
bd40c002dbae2f539b035f31b49f1a3b3efe7e3f206b60d9e06cdff015d09f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 10196 bytes
font_02_sfnt_off0000aa03.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA03 16164 bytes