Malicious PDF — malware analysis report

Static analysis result for SHA-256 867135dbc0b6031d…

MALICIOUS

PDF

59.0 KB Created: 2020-09-07 08:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4a828db3b732eda2a50aa2511e6466eb SHA-1: c6832b2e97e28954df69aaef5428563ead6f54c7 SHA-256: 867135dbc0b6031d45bd0e82ee654617ee8b489ee5dd91245ddfeea1cd307d4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one prominently leading to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL, suggesting a phishing or scam attempt to redirect users to malicious infrastructure. The ML classifier also 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.com/wix?keyword=barlow+condensed+bold+font+free In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/7ea8bb_1b901ece5154429b9e8bffae1dbf47ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/77d535_05c4e4dea75546ddb596da5a312180bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ce14f3_4d2ea4a8880c4e5c8f6fddfcb5e5111f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e5412a_8be2e9a5f3454f0eb428a46e5ff3ddec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/880a7e_106fbfcff2cc48c9bd62e461c36fb08c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8341131268b34d49abf5fd162fc899af.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7f16bd_af44f85cf5644a5bb348f7bf9990651d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5cf23b_1299603a45e64e34bdf708be56701671.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3fb742_11bb15a78267453689622c9e48bbe7ec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ab2b05f74c414cb7b4fb22603b6603d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d935e_ee2c8c45f365463dba425ed2beecfa65.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/99341803598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0129/8594/files/57404145708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/33298520568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/88235002281.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 5296 bytes
SHA-256: 3608c2afb5110acd8c32cb12ea650b7e5f37cb19a8082a07fdd834f3ee62888d
font_01_sfnt_off00007d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D42 25200 bytes
SHA-256: d9d2eb9118a07a1d4e03ae56ea51e8f9d6901df24409d87f00cc507b47102180
font_02_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 16232 bytes
SHA-256: 27847f87b61e54933020a60d4a49edeea4a757990d790c43274c4654316b7647

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