Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b93a26ef9bd414…

MALICIOUS

PDF

44.7 KB Created: 2020-07-30 20:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a193460a4e62b0642313ca4ca7f6dac3 SHA-1: 783f431e30f32f0762da5fb5de78a4cf3e1cb230 SHA-256: a7b93a26ef9bd414391c3fba8ac654a1cd266dbf6c74beacce0ec503f403223f
150 Risk Score

Malware Insights

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

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 'baixar pdf creator gratis', suggesting a lure for users seeking free software. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to potentially harmful sites.

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=baixar+pdf+creator+gratis
    • http://files.thomfogartypresents.com/uploads/1/3/1/3/131382673/a41f75a030.pdf
    • http://files.kmarcus.net/uploads/1/3/1/1/131163683/livunaludekebelozu.pdf
    • http://files.cardenhomebuilders.com/uploads/1/3/2/6/132695575/rupexupo.pdf
    • http://files.wethersfieldwoolfarm.com/uploads/1/3/1/4/131454620/zodijisevebefa.pdf
    • http://files.katieandnatey.com/uploads/1/3/0/7/130740325/juzigakegub-kidowelogixi.pdf
    • http://files.katieandnatey.com/uploads/1/3/0/7/130740325/juzigakegub-kidowe
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/bixewunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/fisomeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/kodovisofuzexanesabenawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/58817964061.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/dusepizagij.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/bilelematewatafodaxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/73550040959.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/83048952495.pdf
    • https://cdn.shopify.com/s/files/1/0437/3066/5637/files/duxorer.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/96399997527.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/tubutitofevepojorivikene.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_off00006f92.bin
cffc3f9a8e3a6e031f43c4247b73783851abe347a88ae507bbe41a869f1ad3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F92 5092 bytes
font_01_sfnt_off000080f9.bin
bba5823809d59ee765bf5166a783487b6ce1da22c5b08c538c15e7d78650be90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 11396 bytes

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