Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f7baf089799e0b…

MALICIOUS

PDF

78.7 KB Created: 2020-08-22 22:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b303a6f6136757853b982172167332 SHA-1: 5065398b36b67dd3fff05be758597db93d3bd763 SHA-256: f2f7baf089799e0bc385d2535aa71f7b6500b1cf71c601e5cd99efbe7af6331b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links, https://ttraff.cc/pify?keyword=echocardiography+report+example, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Echocardiography report example', reinforcing the lure. 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=echocardiography+report+example
    • http://dogune.bostonhelicopters.com/uploads/1/3/1/4/131406344/1181b9.pdf
    • http://tetiju.otterspacearts.com/uploads/1/3/1/0/131070374/7e6545f221.pdf
    • http://files.medinfokit.com/uploads/1/3/0/7/130776757/4109878.pdf
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdf
    • http://pijowa.sprinng.org/uploads/1/3/1/4/131407267/mobobu-kaxukax-xomebenigozup.pdf
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/18179963868.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/bafovodipokog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9428/5218/files/zosusaw.pdf
    • https://cdn.shopify.com/s/files/1/0449/7453/8920/files/drush_add_admin_user.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/haloalkanes_and_haloarenes_ncert_exercise_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0579/files/tenor_saxophone_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/sebi_guidelines_for_mutual_funds_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8904/files/38204948236.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/46198971321.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/xejawoxinu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/kizimevamelakaseginosax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/77079120404.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_off0000edeb.bin
9e4aa6fa2c7ebc47d739abddb3bad172e7b32efdcd920757ab76bc5d7914da2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 5436 bytes
font_01_sfnt_off0001004f.bin
35b2c3167b720db29cb3ca0649273c5bf919124a7c1655ee3666ebe5d38339dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 14644 bytes