Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccf35529bbebb34…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 23:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05e51f0f47c4a8102b3ca3114d4a625 SHA-1: 3324fc0ba4ab86a3d5a8a3c47676bc66af583e93 SHA-256: eccf35529bbebb34b7f5fd35e491e59f25d987939ed79aa998325eae63e58b7b
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a download for 'Ccleaner for pc windows', but it redirects to malicious infrastructure at ttraff.com. This indicates a social engineering lure to drive traffic to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=ccleaner++for+pc+windows
    • http://buxige.risecircle.org/uploads/1/3/0/7/130740141/42e58e46d13a6.pdf
    • http://fafib.fixintogetmixin.com/uploads/1/3/1/4/131482975/69c1715f3bb9dbb.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/farimeropedagid.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/69349625706.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/93681230380.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/17181762036.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/azurewave_technology_inc.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/pdf_book_maker_for_android_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/github_revert_commit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0822/files/pediatric_headache_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0440/1987/5998/files/30914567673.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/cantos_para_arrullar_al_nio_dios_letra.pdf
    • https://cdn.shopify.com/s/files/1/0440/7495/9000/files/sajusubuxojoronamibosut.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_off00006244.bin
704f896fe6e7fbe37db236f0f5983c9f054bcb9884b7e0a172e1679e593805d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6244 5148 bytes
font_01_sfnt_off000073d9.bin
e44a4f1f1141e9df6e27f2d938f154d855a2fccee3ce8a44799e4621ee43f35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 9936 bytes

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