Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52b891d632abc77…

MALICIOUS

PDF

48.0 KB Created: 2020-07-28 12:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba24e806396f096cc54995c923d90b5 SHA-1: a718025f9bb415b200a1fb1b94f5a78e6d9864ad SHA-256: c52b891d632abc777b2f7afd647fa2c36158ee5c0126bd5028dffc064dbcff5d
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=tn+scert+books+pdf+free
    • http://files.jmhomeimprovements.co.uk/uploads/1/3/2/6/132695546/zetariv.pdf
    • http://files.childrenofheritage.com/uploads/1/3/1/1/131164310/karix.pdf
    • http://files.zferenovations.com/uploads/1/3/1/0/131070072/kaxolina.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/jezukajalobijidibidetabo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6004/3682/files/mawixonemumegakitaxinura.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/50229824783.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/30603720295.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/jaxaxubasasejafufigin.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/30333846219.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/sobakiditabokafadazu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/90254553902.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/kujabuposunur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/50198611141.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/58676516226.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/5161918783.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/xuwaduj.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_off00008057.bin
e7d64f1f7939e4281c1b75ac37051b157271a9f6ce2dea83620eea213c795e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8057 4800 bytes
font_01_sfnt_off0000909f.bin
aea327f6cb3ef5de1d16c69a410a70c4135363201e4a5eb3cebaeb54e96f1dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909F 9948 bytes

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