Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3b7992426d3144…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 22:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc03b0308cf69f8be8d1d9a98edeb27e SHA-1: 40ebd6f03dbfb844fa3adbc85f6041539fd7cb20 SHA-256: ac3b7992426d3144e48792d884b59e7896eae47329b1ddbcae0d51d2cbf66c7c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains a nonsensical string and a URL, suggesting a lure to a malicious site. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution page.

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.link/wix?keyword=chunky+monkey+shanky+cartoon
    • https://static.usrfiles.com/ugd/bdeb4c_c53943ea88e8445bbaf74c986e08ab05.pdf
    • https://static.usrfiles.com/ugd/c63dba_eb23c29396344c0fa453d0f66d66a804.pdf
    • https://static.usrfiles.com/ugd/e80f4c_16fe0a8fc3354d32ae68959a928e13d8.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/journal_ennahar_algerie_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0460/0899/1905/files/83359113001.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/ribexopusilulatenanuse.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3252/files/fagasesuvasulikogixenudon.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8903/files/jumugakorofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/asciidoctor_header_footer.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/tonafefavujadumosozuseja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/221298046.pdf
    • https://static.usrfiles.com/ugd/097bd5_50f8b4aabb9f4ea79449fb06365f84b7.pdf
    • https://static.usrfiles.com/ugd/15cd4d_587adadc132347d2b6b72a87b5482891.pdf
    • https://static.usrfiles.com/ugd/b9801a_98495067c7074aee8acbe570805a3a2f.pdf
    • https://static.usrfiles.com/ugd/89c6ad_99553dac3e4c4beea2232368b5590b47.pdf
    • https://static.usrfiles.com/ugd/5b5da7_8eb91c46b0be4f1ebe1f161398a57029.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004808.bin
d11fee256fa237601dc033053d06b1ea789b26b1cdb3afa45d95bddd00829238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4808 5076 bytes
font_01_sfnt_off0000591b.bin
6642c6ce1479a2792bcd46bb466dc6425574cb71092f002943da9add5bd19d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591B 4104 bytes
font_02_sfnt_off00006952.bin
5511aefdaf264404cb3ccd9de54b9a6e308bce22339d3f3c66c92dd67790af4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 9656 bytes

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