Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6085f45ff76db6b…

MALICIOUS

PDF

47.4 KB Created: 2020-07-27 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9da7a893c57f62c1f89d54c4e072726 SHA-1: 640ed83eba2a169870917ec2433196767cd1b1da SHA-256: b6085f45ff76db6b9dae3cec0d1658d693e8b1c5fca8446a53e08f378d0ad6df
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to 'Arabic joining letters worksheet pdf'. The presence of multiple external PDF links, including one hosted on Shopify, indicates a link farm strategy to potentially improve search engine ranking for malicious content or to distribute further payloads. The ML classifier 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=arabic+joining+letters+worksheet+pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.mrstuckeysclass.com/uploads/1/3/2/8/132815791/lodiwepo.pdf
    • http://files.atallamdshop.com/uploads/1/3/1/3/131379594/bemutugol-vunasevijipivo-sidutukome-kunafosonobisuf.pdf
    • http://files.atallamdshop.com/uploads/1/3/1/3/131379594/bemutugol-vunasevijipivo-sid
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/26094324065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/84186492548.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/57659761227.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/50544283310.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/xurepijazinajoriwuxize.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/tegedojuwusenexipijuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/daluled.pdf
    • https://cdn.shopify.com/s/files/1/0440/8374/0822/files/biwejutimegiwevabaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/81605792184.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/9109568511.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/30614788671.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
stream_007_off000094cf.bin
6530a9b8437d26e5abf30c67a93881f76ee55928dcee63111ac76a1f1b6d168d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x94CF 18556 bytes
font_00_sfnt_off00006107.bin
6aecf11a7307808ae15a2632baa6299f612363f2029c9bb936ba663f56ff564a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6107 5568 bytes
font_01_sfnt_off000073f1.bin
e5f3b2234193a5cf660c886dcf6e83e145f109ad57e47ecc98c31103fba96437
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 9536 bytes