Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aa646ed835b0e7…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 23:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a943c83f90a8d81b24ed307a663603e6 SHA-1: 98c60adc6da226dadacf32404224733cba44cd29 SHA-256: f1aa646ed835b0e7f20b17022da8fece3792da5548c7bbca988b269cd26810bd
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'solving equations word problems worksheet pdf' and the malicious URL. This suggests a lure to trick users into clicking the link, which then redirects to malicious infrastructure.

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.ru/pify?keyword=solving+equations+word+problems+worksheet+pdf
    • http://files.movewithmeg.co.uk/uploads/1/3/2/6/132682976/c97b2163c9.pdf
    • http://files.losazaharesvillas.com/uploads/1/3/1/4/131483955/f4426a0a7937285.pdf
    • http://files.lindaellenphelps.com/uploads/1/3/1/4/131438299/1875333.pdf
    • http://files.annamhenderson.com/uploads/1/3/0/7/130739146/gekejinatafotuw-tosafi.pdf
    • http://files.statenislandfriendshipclubs.com/uploads/1/3/0/8/130874125/dikifazoxifu-zosajuwo-mujetagogexik-fesopobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5535/files/31210063927.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/jadivezijuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7885/files/45699771028.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/building_design_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/diviloguzoxisojasusire.pdf
    • https://cdn.shopify.com/s/files/1/0437/3368/0282/files/14475929443.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/moselopaw.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_off000060d9.bin
cae983ad3e132336e524268117e4c8a44ab0b1b5d071330904162fce9c097126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 6040 bytes
font_01_sfnt_off0000754c.bin
cb5514d7415289b54369c6a337dfa0dbcc16dcacebb2181b59931c5410ed557c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754C 9904 bytes

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