Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9b3990b6677d68…

MALICIOUS

PDF

47.7 KB Created: 2020-08-26 15:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da317abfc63582e3a0129ec059b67ce8 SHA-1: 1973ad0242d22ea0daddc29d8d5d86fc3210005c SHA-256: 5a9b3990b6677d68d4398d504dc57ff4ff5502e216d49c3f7888103a2310719e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same malicious URL. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=capsa+susun+hack+apk
    • http://jisil.northwestmontanagoats.org/uploads/1/3/1/4/131483281/jisulizasimo.pdf
    • http://files.bgprodaniuk.com/uploads/1/3/1/0/131070178/nejutebus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/live_football_tv_streaming_hd_app.pdf
    • https://cdn.shopify.com/s/files/1/0441/2624/0920/files/26431958303.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/77416724437.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/40070847884.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/56348379369.pdf
    • https://cdn.shopify.com/s/files/1/0431/3517/2770/files/application_of_nanotechnology_in_cosmetics.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/42858230079.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/itunes_for_linux.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/4078272127.pdf
    • https://cdn.shopify.com/s/files/1/0435/5522/5763/files/kexilitopunek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/cell_organelle_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/voriroxisamewinafiwifavun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/72125422502.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_off000066f3.bin
ef2e1dde3b7a97eaa74d2993b1f97caf3e2e192178d8447625508b70950d8c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 4860 bytes
font_01_sfnt_off00007774.bin
352a876099fdef4184a0ce020e372e3ad0dbfa0a73ca46ac5a7e29dfa9311c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7774 11452 bytes
font_02_sfnt_off00009d09.bin
da9784c099e5a8bc41ab28ab6b0f706bbb561d129e983fef757841920625d5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D09 16096 bytes

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