Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ff98d5b95dc146…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 01:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f8b0625cb1afb3ae1ee4b9842fee8b SHA-1: d4bb306ce103e7ffa7fc7ed1f50dc71204fe6132 SHA-256: d1ff98d5b95dc146fae05d06a7e7363bc3c28ed98e285cf23e3178fca0b2185e
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bralette sewing pattern pdf' and the wkhtmltopdf application, suggesting a lure to disguise malicious intent. The presence of a link farm and a high ML classifier score further support maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=bralette+sewing+pattern+pdf
    • http://files.nandaphoto.com/uploads/1/3/1/3/131383934/dawun-mukeresavabuda-digaxafulub-piteluxanabifu.pdf
    • http://files.timothylindstrom.com/uploads/1/3/1/4/131452997/8825738.pdf
    • http://files.gianocromley.com/uploads/1/3/1/1/131164174/8695753.pdf
    • http://xusoliv.rivercityaikido.com/uploads/1/3/1/1/131164250/4d54ea41eea769e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/59277560418.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/bosizikizitinigapan.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/22834091175.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/satofoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/68321230114.pdf
    • https://cdn.shopify.com/s/files/1/0438/2294/0320/files/42050876839.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2067/files/26429906183.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/31129070299.pdf
    • https://cdn.shopify.com/s/files/1/0437/5838/7349/files/10252376292.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/aashto_lrfd_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/89441716277.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/fimimasisatudopiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/63338873670.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/6743164671.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/flip_words_free.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_off00006d98.bin
307907500bab3b083d37efb2c9e654a6ac9d1854210f8770a4db8ef681fc7604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D98 5348 bytes
font_01_sfnt_off00007fec.bin
0a49f6593aef9602dcb5ec609f419f64cdc9aa70c887786ff1e16dd24b437d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 11692 bytes

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