Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b35b158af9ceb4…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 12:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e508929a1007d6a10a8805f63b05a70 SHA-1: 59ac471dfd68edcc84da971c9c2b0d37e22957bb SHA-256: 55b35b158af9ceb417471359ecbfeb05e304f8e1a746d7b988def8635fa02c69
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=solving+linear+equations+with+brackets+worksheet+pdf, which is likely used to lure victims into clicking through to malicious content. 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.cc/pify?keyword=solving+linear+equations+with+brackets+worksheet+pdf
    • http://files.whatchelseaswatching.com/uploads/1/3/0/7/130775341/3180127.pdf
    • http://files.northmoruyasolarfarm.com.au/uploads/1/3/1/4/131409463/nimimax-tigek-rokejelemi-jajolafagukojet.pdf
    • http://zedunidak.erspamermusic.com/uploads/1/3/2/7/132741073/03339da.pdf
    • http://wojufew.dave4spotsy.com/uploads/1/3/1/6/131606490/zajirovasudela.pdf
    • http://files.norfolkaggieparentnetwork.org/uploads/1/3/0/8/130873942/5308867.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8257/files/autoclave_function.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/calculating_standard_deviation_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/catholic_church_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/56754106738.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1816/files/lunimevinulogowipulekagup.pdf
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/minecraft_unbreaking_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/2347/3568/files/97007908132.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/39733301248.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/95998178831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/85875964350.pdf
    • https://cdn.shopify.com/s/files/1/0432/2200/7969/files/91924032696.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/94939653825.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_off00007566.bin
9754524b420c23209541129e25e14c2e0fc95e60710bc8e8ec0d438e5f205a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7566 6000 bytes
font_01_sfnt_off000089d1.bin
34e499920a8d3b850521a559f833bebb5fa4d6c7c98ed2013681503fcff31b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 10284 bytes