Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4954594d517d7ab…

MALICIOUS

PDF

53.4 KB Created: 2020-07-30 22:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30b32de1c8726e08573a922baf70454 SHA-1: 7131dec4780ad599e4ce229ec3cd7649d269fd6d SHA-256: a4954594d517d7aba749e46bcec6cfbe4266aa42467b8152268f83697c6da9a5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common technique for SEO poisoning or redirecting users to malicious sites. One of the URLs, 'https://ttraff.ru/pify?keyword=anne+bradstreet+the+prologue+analysis+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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/pify?keyword=anne+bradstreet+the+prologue+analysis+pdf
    • http://files.invergowriehomestead.com/uploads/1/3/2/6/132682897/rebodujak.pdf
    • http://files.ssscorp.org/uploads/1/3/1/3/131380842/nusiv.pdf
    • http://files.lord-and-associates.com/uploads/1/3/1/4/131437484/3558899.pdf
    • http://files.lord-and-associates.com/uploads/1/3/1/4/131437484/3
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/zidowazanaxevevig.pdf
    • https://cdn.shopify.com/s/files/1/0434/7222/4421/files/32045560635.pdf
    • https://cdn.shopify.com/s/files/1/0431/9376/1941/files/98748741730.pdf
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/xasivazajifuzifo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/rexefiwewojufat.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/44353103858.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/86503355530.pdf
    • https://cdn.shopify.com/s/files/1/0434/0042/9731/files/funuvatuzunox.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/bidesoputilizog.pdf
    • https://cdn.shopify.com/s/files/1/0428/7486/3772/files/xixedipemabisel.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/xisebuves.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/josanu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/28261547165.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_off000092e2.bin
f4ede73936ab4f2012d64ef5ce66256036c82a5784bfe3d2112b48dff03ddf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 5416 bytes
font_01_sfnt_off0000a53c.bin
2c4093cd669d51ff924e7baa287cdbf9c1e654cd9a78fb3ab4c4aa0783897770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA53C 10276 bytes

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