Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf15ab32e87a22c…

MALICIOUS

PDF

39.6 KB Created: 2020-08-11 14:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c53d8a0b129bc1a1de75e8fc1d194b SHA-1: 930385a5f5524277aeb8adc4cbcbcf3f62c63c37 SHA-256: 7cf15ab32e87a22cd44ba02d4093f731a5cb5867bfeeb90e7280291a2f42f9ae
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates a link to known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to 'Barron essential words for the toeic pdf', suggesting a lure to disguise the malicious links as legitimate content. The presence of numerous links, including one to a malicious redirector, strongly indicates a phishing or redirection attack.

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=barron+essential+words+for+the+toeic+pdf
    • http://gepiniv.savannahbrooklynharrell.com/uploads/1/3/1/6/131607600/konedajeletixiw.pdf
    • http://files.bearcatmusic.org/uploads/1/3/1/4/131453255/zoramimuvinu_golix.pdf
    • http://files.highperformancecoachkelly.com/uploads/1/3/1/0/131071063/gakib.pdf
    • http://files.aayogaandwellness.com/uploads/1/3/2/8/132814030/fidibebina-pifetelozix-norizi-dutadak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81599599528.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/togofesajekisujanozifetaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/gadadiwop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/58674361009.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/13216491884.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/pebewovifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/51025491685.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/40696750961.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/fapotemiwapukepawu.pdf
    • https://cdn.shopify.com/s/files/1/0447/9533/0717/files/diablo_3_whirlwind_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/62955446530.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/82495894476.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_off00005c86.bin
d0abf90e53969de50bbd02c4f38a159714530d15e2b17bdb07dd6b25dce00ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C86 5384 bytes
font_01_sfnt_off00006edd.bin
1fad6f3db79b39f4c3da23a1be0ebdb66b074091671d2f5f712148eca16ad0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDD 10000 bytes

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