Malicious PDF — malware analysis report

Static analysis result for SHA-256 834f23bfce99b58e…

MALICIOUS

PDF

45.8 KB Created: 2020-08-22 19:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974ab560e72757c3a58f914138b22551 SHA-1: afed3c1a7cd946ade1838f4b8c395322def3579c SHA-256: 834f23bfce99b58e4b7e469c32e4ca3960ec0767903438d5b872dcb33ab494ea
150 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm hosted on Shopify, likely for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to deliver the payload. The document body, though heavily obfuscated, contains the string 'hungry shark world hacked apk ios' and the malicious redirector URL, suggesting a lure for users seeking game hacks. The ML classifier strongly supports the malicious nature of this PDF.

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=hungry+shark+world+hacked+apk+ios
    • http://xaloxigu.windowsmanchester.com/uploads/1/3/1/4/131483254/4322674.pdf
    • http://vomamix.midwestmattress.net/uploads/1/3/1/3/131379530/2146189.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/weight_watcher_sample_menus.pdf
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/givixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/89958655858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/free_acrobat_pro_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/chemistry_periodic_table_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/38001168407.pdf
    • https://cdn.shopify.com/s/files/1/0433/8506/1541/files/nelimagupug.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/23027731960.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/4720589391.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/kebekoxidiwap.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/85327596906.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/86496447188.pdf
    • https://cdn.shopify.com/s/files/1/0439/1531/3307/files/63568237973.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659f.bin
5a3f3b149b690608da44514253ac8c2a55f1f49b4cbad25569093f88aa56348e
pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 5356 bytes
font_01_sfnt_off000077cb.bin
8afaa9968145862d3d0eeffca9e388ab83931947033b97fd7f8aeebd644b4fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 10580 bytes
font_02_sfnt_off00009c04.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C04 4324 bytes