Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d21f38bf8924df…

MALICIOUS

PDF

57.2 KB Created: 2020-08-22 07:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec3154396d620c0067161abb038afd0 SHA-1: 8101dfafa05ebca454a3792536b3192545fe91b7 SHA-256: 23d21f38bf8924dfb9acd9d5f36593eed1db1e4e4233f97233d30f167dcbbe7b
128 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, with one critical heuristic firing indicating a malicious redirector. The embedded URL and the document body text both point to a lure related to 'dulcimer sheet music free'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or lead to a phishing page.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dulcimer+sheet+music+free
    • http://files.mollymurraybirthdoula.com/uploads/1/3/2/6/132696077/1874681.pdf
    • http://xovima.weplaysotheycan.com/uploads/1/3/1/4/131483418/dexokozilipexerozoku.pdf
    • http://files.discoveringtheremarkable.com/uploads/1/3/1/8/131856034/zifiv.pdf
    • http://files.isleofhopesteam.com/uploads/1/3/1/4/131454034/vivafojujite_lewopuwuf.pdf
    • http://batebibu.softerthanbrittle.com/uploads/1/3/1/4/131407089/2348155.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/schindler_s_list_theme_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/fimanajaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0822/files/51792411557.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/benzodiazepnicos_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/pasobapuxoberagilap.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/i_ve_got_big_balls_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/manual_backup_iphone_to_icloud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8823/files/72257074574.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/carnatic_flute_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/bibawiwod.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_off0000a449.bin
5659ebf759f346791389c404b652197b22c202993bd7ccbea2b43610d76249c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA449 4908 bytes
font_01_sfnt_off0000b4db.bin
09532641e3fcda3a87b5205ecbea57f9bacd6bd63cd383efba31924cdcb85726
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 10208 bytes