Malicious PDF — malware analysis report

Static analysis result for SHA-256 c520b2fddeed8a34…

MALICIOUS

PDF

42.3 KB Created: 2020-08-13 22:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acb926097cad37ce10b9faac5d2f30d0 SHA-1: 57ad24cf5e24b6186706873515e09539b4268466 SHA-256: c520b2fddeed8a34347fcc288ce85f34f0aa016052bca6e706b111da98bafaa8
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the same keyword as the malicious URL, suggesting a lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure itself is used for the attack.

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.cc/wb?keyword=manualidades%20con%20botellas%20descartables%20en%20forma%20de%20animales
    • http://difuvove.chicagobrickpaving.com/uploads/1/3/2/6/132683188/6196700.pdf
    • http://vexaje.krisbenyopottery.com/uploads/1/3/1/0/131071164/xugiwesoxovagipowi.pdf
    • http://files.lesswastelaura.com/uploads/1/3/1/0/131071037/xakejuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2343/files/tagizaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/kemolijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6322/files/5745181307.pdf
    • https://cdn.shopify.com/s/files/1/0440/2357/8789/files/what_is_a_frame_of_reference_example.pdf
    • https://cdn.shopify.com/s/files/1/0436/6663/6953/files/66155258718.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3712/files/maferelojunonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/lanoborogokipusigos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/88958580011.pdf
    • https://cdn.shopify.com/s/files/1/0430/9847/2605/files/dasubagoge.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/finnegans_wake_lyrics.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
font_00_sfnt_off00005c13.bin
ef6ca6e16c61494815a714f92739649ec615108e492ed22655593b11c62fa2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C13 5312 bytes
font_01_sfnt_off00006dfa.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 1800 bytes
font_02_sfnt_off00007688.bin
4070b561cde4923075fb0838439b3c85976c12ed820d567707aa8ec63b77e818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7688 10764 bytes

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