Malicious PDF — malware analysis report

Static analysis result for SHA-256 185479c8bbba24e8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-20 21:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c63e2165ff4204f5ae3ebd100a8c6a7 SHA-1: 66f209a346f6c86a0514fd0a0b4284364ea00a2d SHA-256: 185479c8bbba24e89f49a2d03306a07fc58d15020f38216a7aa31a8ea28f0e1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute further malicious content. It also hosts a large number of other PDF files, suggesting an attempt to manipulate search engine results or distribute malware through a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains embedded links.

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+cartoon+3gp+mp4
    • http://files.cassieabate.com/uploads/1/3/0/7/130739247/2171387.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://files.forestecotherapy.com/uploads/1/3/0/7/130739593/32f52a90bb3.pdf
    • http://files.jyothischool.com/uploads/1/3/2/8/132815916/bavaziw_lipeb_fapegumazepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/2000220836.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/famuwizewavovidolupam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/92908888411.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/kavujelawofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/gapowunuvuxor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/western_civilization_spielvogel_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/bicolano_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0429/5688/2086/files/zinuf.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a34.bin
db173acc1c24edccdcabb71139952fe88bb5d54709840e5ce3a99c043be87725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A34 5376 bytes
font_01_sfnt_off00005c68.bin
7f767c63b5309d1eec249a4bd58ad07fdb9634b6e96d47b2e345005f0f093a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 5860 bytes
font_02_sfnt_off00006f85.bin
fe8cfb22695aadcef6326fd4c54d21323913fade470c5a72c963db4c699073d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F85 2712 bytes
font_03_sfnt_off00007b46.bin
39d0f5b064b88396ec7fe70f160c9d7baf387af11e4ae2df564ca6cf3ff96048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B46 10400 bytes

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