Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae7e46654b560d7…

MALICIOUS

PDF

48.4 KB Created: 2020-08-19 16:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f996989a7d531cca0b56e97f58f58f64 SHA-1: 906d0d9e0f3561cb1e008deb7792338ffe0afb07 SHA-256: 2ae7e46654b560d7e84f4b849a4f5c0c8bcc4de829aeeeb89754da2f1316f295
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=arch+linux+list+manually+installed+packages
    • http://files.lyonsvet.com/uploads/1/3/2/6/132695354/tilegiziwev.pdf
    • http://mevetovi.edinburghlets.org/uploads/1/3/1/3/131383514/1285922.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/zimowabozurumogugapufane.pdf
    • https://cdn.shopify.com/s/files/1/0448/2285/5837/files/lopewugexukoduxilukeguzif.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/48089079563.pdf
    • https://cdn.shopify.com/s/files/1/0433/9335/1843/files/bose_quietcomfort_25_android_canada.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/doing_ethics_lewis_vaughn.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/waladako.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/tinodelapuzuvanegata.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/vlive_run_bts.pdf
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/python_round_to_2_decimals.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/nafojof.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/gikegilenamedomoled.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/muzudas.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_off00007dc7.bin
7b3d52853a1fba0a4c4fe3ba92f04f9ed2da2ca73e8fe9d6d3ff8e4dde8569ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 5708 bytes
font_01_sfnt_off00009109.bin
2b0ad8c08fbd9fd4a176a126eb2ed94707f1155e82c087bb2aeaeb039c0ee1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x9109 10432 bytes