Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49e0045b199a453…

MALICIOUS

PDF

38.0 KB Created: 2020-08-20 02:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31bfd80919293805efd44eed01959128 SHA-1: 744438605ff4d3254311f4f253f8b3edaf6d88e3 SHA-256: f49e0045b199a45386083650e03035c7fb162b1c8eb24a6f96b2db0c23bc1d9f
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, forming a link farm, with the primary redirector URL being https://ttraff.ru/pify?keyword=ksi+new+age+free. The ML classifier also strongly indicated maliciousness. The document body contains text that appears to be part of a lure, possibly related to 'Ksi new age free'.

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=ksi+new+age+free
    • http://wowuwad.worldchampionshipgoatcookoff.com/uploads/1/3/2/7/132741194/tiwix.pdf
    • http://lepem.stylish-mommy.com/uploads/1/3/1/4/131407424/pisavuditew.pdf
    • http://files.warringtonpenmanship.com/uploads/1/3/0/7/130740438/suzagawovavo_vatavixaf_takirut.pdf
    • http://vafik.eullallia.com/uploads/1/3/2/7/132710657/motuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/chatterbox_origami_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/6348658966.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sufegikar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/rotuzalufut.pdf
    • https://cdn.shopify.com/s/files/1/0440/1568/1701/files/ncert_chemistry_textbook_for_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/benasidazunepazikapabeber.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/45598341399.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4423/files/vugerinedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/79342418338.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/paxeno.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_off00004e19.bin
3f9f7e13f9ad4ce5eac36c0cd356690765d0bf107553fe6d1e178caa9d31de48
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E19 4964 bytes
font_01_sfnt_off00005f25.bin
700aa7cea036add8f54ff15576d2169c31d208b54b7f481a90ee501499245ce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 14316 bytes