Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d4445354f8cf4…

MALICIOUS

PDF

53.0 KB Created: 2020-07-29 17:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5140135d3a15532485459cea64327b7 SHA-1: c1f8431dc52aa359617a2f99aec04c76b8ae7163 SHA-256: 3f1d4445354f8cf49ba8a17dbb1fefc9e5e78cbc01c5fc67a008225e2b7782b9
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The embedded URL `https://ttraff.ru/pify?keyword=abirami+anthathi+lyrics+in+tamil+pdf+free+download` is likely part of a social engineering lure, disguised as a free download. The PDF also contains a heuristic for PDF_SEO_LINK_FARM, suggesting it's part of a larger network of linked documents. The ML classifier also 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/pify?keyword=abirami+anthathi+lyrics+in+tamil+pdf+free+download
    • http://files.dcgrandprix.org/uploads/1/3/1/8/131871518/lafofivojemid_jamevuzifes_legokeguku.pdf
    • http://files.stjohnthebaptistschoolalumni.com/uploads/1/3/2/6/132696048/zereparebi_kakepevido.pdf
    • http://files.olaelua.com/uploads/1/3/1/4/131406544/3142557.pdf
    • http://files.katiebeaneyoga.com/uploads/1/3/1/4/131482952/34ce98c4255b.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/zaxavav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/26253209822.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/wireminuwebi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0438/4237/1741/files/zulomisamirema.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/59120092080.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/46162476487.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/malinakojasisutejizarav.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/53081502817.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/57994455111.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/fenotiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/14658854802.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/
    • https://cdn.shopify.com/s/files/1/0428/9835

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00007fd2.bin
733a2e5844e9fcfc8ae9cd3c28df10ed0e4f4a275b1a39210b622fb87f22d05d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7FD2 14112 bytes
font_00_sfnt_off00006d4c.bin
13e58c4783ab28425584242f73a6e29b22efc5d9c4c0e8810f48b3a4696097a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 5504 bytes
font_02_sfnt_off0000a15a.bin
a69e65767b2c37223fa81ca939acbf9fb68f97ab95d4dc9fb1da1e1c6d9d264e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA15A 10932 bytes