Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5dc223cc23c87…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 08:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa912a7fbb47ab23d6c4f70dfedf3b9 SHA-1: 777bcc5ebd0c78993a45c793aa40af607a803835 SHA-256: 81e5dc223cc23c87097431f0a6940f568ffefd6bb91a47b8ca1cba1703d1f85a
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a download for 'Minecraft earth world map'. The link points to ttraff.ru, which is flagged as malicious. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for the malicious link. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=minecraft+earth+world+map+download
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/70172928105.pdf
    • https://cdn.shopify.com/s/files/1/0465/3793/2959/files/the_birds_daphne_du_maurier.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9869/files/rotebajemutuga.pdf
    • https://cdn.shopify.com/s/files/1/0464/7426/4744/files/bajaxumorelimezode.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/lunavizusadezofinip.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/genetically_modified_organisms_journal.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/dewukamizevupeti.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/kumosuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/pivesobuxelebeteru.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/83001630419.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/80427152793.pdf
    • https://static.usrfiles.com/ugd/05900a_b8e6722a724e4175a1a835fed74b3e2c.pdf
    • https://static.usrfiles.com/ugd/4725f1_575f6f4cef024487997cf6026ca2574b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.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_off00007acf.bin
12dc48c0ee52ee2f2eb6ce90f27d6a82f01a013b3b480d027ce2dfaf5f3aa59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACF 5316 bytes
font_01_sfnt_off00008cc8.bin
f129ad5ef5b4450d278f41d3f8b150c747f58c85c6a2d29f969d1e48378f878c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 10476 bytes

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