Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06b78f98ed38a19…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147850779992fcc187eedaffe599b4aa SHA-1: 11fcaaae34008f31c2cf2997951d42fcdc01fb14 SHA-256: c06b78f98ed38a19af09da122cf5a5c793e4796e8d1caedbb9cafb7e384d7a49
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure at https://ttraff.cc/pify. The document body, though heavily obfuscated, contains text that appears to be a lure for a "boy scout webelos handbook pdf". The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or content-spinning operation designed to attract traffic. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=boy+scout+webelos+handbook+pdf
    • http://files.timelyap.com/uploads/1/3/1/4/131437311/selaridov.pdf
    • http://files.proflightuas.us/uploads/1/3/1/3/131381540/38468b5ca043b.pdf
    • https://cdn.shopify.com/s/files/1/0440/4684/4054/files/67895894984.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/4167138262.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/9047056579.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/argus_monitor_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9013/9549/files/nerosuwozudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/fofixukozuwejewim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/72058160941.pdf
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/dibomagakupoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/vipavoxeruli.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_off00005b4c.bin
91eb5c20cbb3729a13dcf3c79000888ff79cc0ecc9fc6ddf5323a2b513dd9a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4C 5596 bytes
font_01_sfnt_off00006e63.bin
f5d194bd15a396e683dcd56f5bae8db52d8bfb1820a24f74dbe3eba970b8343b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E63 10088 bytes

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