Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b5fec839b52b95…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 14:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff638a253f8d2082843b165c4cf10402 SHA-1: 7f55471a507af4d969a8e689d2f439467d9aa9f4 SHA-256: 84b5fec839b52b9592fa83eb2a67396426769e8475d2c257837858d12ec85e4f
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.com/pify?keyword=grade+1+english+worksheets+pdf'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for educational worksheets. The presence of a link farm heuristic further suggests an attempt to distribute malicious content through seemingly legitimate channels. No scripts were extracted from this sample.

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=grade+1+english+worksheets+pdf
    • http://files.adventmoravianbethlehem.org/uploads/1/3/1/3/131381910/bosebamatoza.pdf
    • http://rivupa.higherlevelevents.co.uk/uploads/1/3/1/1/131164250/7367124.pdf
    • http://nerip.casadeartegallery.com/uploads/1/3/2/8/132814930/newasewonanerajefag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/japefidiluwugomajab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/65939000279.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/meningitis_por_staphylococcus_aureus.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/angulos_formados_por_dos_rectas_paralelas_y_una_secante.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/merozenanusobasotadif.pdf
    • https://cdn.shopify.com/s/files/1/0429/4498/7292/files/satowazedelojutenaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9535/0684/files/gonenumebes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/54156867839.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/negipozes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/44934023313.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/39418159734.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_off00005f46.bin
f9c29e2b08c557bdb477815377b33bf16566bbdfa15f479b32517f2504bd4025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F46 5544 bytes
font_01_sfnt_off0000723d.bin
023ecab7ad01aa301545eb7fb89aef33b92e712b47a69d9e8fca94c280f47bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 10120 bytes

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