Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2f043da895827…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 14:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a16758a9ea320ad753ec78e71300550c SHA-1: b58cb05239262ec3c85adf6adec4d59f0409bf14 SHA-256: f4b2f043da895827b79ae9a5c696ab5e1f03caafd6b659217471546c6b0bbc9d
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free worksheet, which leads to a link farm. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=free+multiples+worksheet+4th+grade, which is designed to redirect users to other sites. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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=free+multiples+worksheet+4th+grade
    • http://files.acrha.org/uploads/1/3/1/3/131397964/vanovegifivo.pdf
    • http://files.artbyjenniferharrington.com/uploads/1/3/1/6/131636655/kepigoranomalil.pdf
    • http://files.createmoremusic.com/uploads/1/3/0/7/130776516/kikuwafonabogiwur.pdf
    • http://files.acuityultrasonics.com/uploads/1/3/1/4/131407552/a2530.pdf
    • http://files.geoed1.com/uploads/1/3/0/7/130739910/168275.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/31263187907.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/gilapari.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/61463388916.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/rugutifuvijun.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/zufipumiduxexuwiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/eu_antonin_artaud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3204/1889/files/poviroguwajatoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/xobusugabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/16665289693.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/kifabijelupamupik.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/nosaruzubavokebivumuvok.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/iupac_nomenclature_of_spiro_compounds.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_off0000632a.bin
7591ae31b91c711c8ecf3b6443413cdd12885ae860a294a5e9fe3188672b2f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 5572 bytes
font_01_sfnt_off00007611.bin
47553df048ee865df7bf5860499d3e98b75e96aef876557e1f0f33283ccd6480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 10368 bytes

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