Malicious PDF — malware analysis report

Static analysis result for SHA-256 23622e3c88997d98…

MALICIOUS

PDF

58.1 KB Created: 2020-08-02 19:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a3e927e7af469588b4931e9b1bc135 SHA-1: c088e7f42348c1063b086548b2fc1ca90c68ac2e SHA-256: 23622e3c88997d9888a80391bd34c1b368d7a3b96c3bd241e686a09dd5ce9164
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=etc+defaults+grub, which is likely used to redirect users to a malicious site. The document body contains garbled text but also includes the malicious URL and several benign Shopify URLs, suggesting a content-obscuring technique. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=etc+defaults+grub
    • http://files.marcelstewartart.com/uploads/1/3/1/8/131871799/045516082cf.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.fundep.org/uploads/1/3/0/9/130969190/jiworefukaxitixasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/zugiwojijovirezuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/86527442156.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/84372024155.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/rukawuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/68587968799.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/the_chronicles_of_thomas_covenant.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/wivemegufewelofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/the_world_s_end_full_movie_123movies.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6095/files/fairy_tail_episode_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/xerunebesonatebesoririk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/modumazujuradometujodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/45037320417.pdf
    • https://cdn.shopify.com/s/files/1/0440/8426/5110/files/39192554862.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098ba.bin
77934a9439674a7fa1a785c136b6dd355712882ab0e8524364f5dbffc5f4ca6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x98BA 4904 bytes
font_01_sfnt_off0000a971.bin
5d3aa0a02c35af3174388ab6310f64087607e08e77da6821113c7bea009cce0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA971 10600 bytes
font_02_sfnt_off0000cd7a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 4324 bytes