Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4410bd60bff1c8f…

MALICIOUS

PDF

45.3 KB Created: 2020-08-02 15:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f8156b205490c5fc18e5ca6a92cb336 SHA-1: efa02bac4269b23971eff04deba8429a4bb234b3 SHA-256: b4410bd60bff1c8f859e7f539af92beb6985cd420e48e8aeae93aae48ac81bf2
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for free magazines. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to lead users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of compromise.

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/pify?keyword=download+free+pdf+magazines
    • http://files.natural--living.com/uploads/1/3/2/7/132710601/7720991.pdf
    • http://files.pennlawblsa.com/uploads/1/3/2/6/132681219/814bc9478d37b6.pdf
    • http://files.sarmitesstudija.com/uploads/1/3/0/7/130776131/gemamum.pdf
    • http://files.fwsomusicians.com/uploads/1/3/0/8/130814226/8950971.pdf
    • http://lutet.clintonstudio54.com/uploads/1/3/0/7/130776757/2018808.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/27186045489.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2268/files/zivuzomatexedus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/valinedediv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/pifemorowiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0102/files/86320796004.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/7354215223.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/53576768796.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/vugerepokevufivuvarudida.pdf
    • https://cdn.shopify.com/s/files/1/0436/3255/8240/files/napiropovopiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/fesibumumurofobidanudemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/nusijejetezaka.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_off000072e4.bin
8a096244997640440da4bdc0053fe047a25cf29a3fa9991fe211d89fbe30bb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 5500 bytes
font_01_sfnt_off000085af.bin
c45d45c3c69554db355344a288b6fb6bf1789aa8cc72c87f862e22a1f24b61a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AF 10156 bytes

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