Malicious PDF — malware analysis report

Static analysis result for SHA-256 872d0961abf1cac1…

MALICIOUS

PDF

51.8 KB Created: 2020-08-29 00:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a7b34b0cf241335d5327e6d1904e31d SHA-1: 215351f41fe39468732094ea5f62881c7fec9ac5 SHA-256: 872d0961abf1cac141357351efe1181ed58712711f780d43013cf2fc9a58ee15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a list of other URLs, many of which are benign Shopify links. The presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute content broadly. The ML classifier also strongly flagged this PDF as malicious.

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=escala+de+autoestima+de+rosenberg+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/bilafobipamususamadale.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/10738380054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/mofanoxanu.pdf
    • https://static.usrfiles.com/ugd/b8c837_51a779df1f9348c3967d9a86dfea61fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_82c0bf740d0c4bbcad856d7bcbf0050f.pdf
    • https://static.usrfiles.com/ugd/b8c837_17843f1b74f547aab2b79d085ca6893f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_d24f5c1e38fc4a3c91b54e5b65764412.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd5c1e5383ec4a6cb593011b71e4da39.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7888/files/lofedekadifipavufu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/allelic_interaction.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/bodof.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f6.bin
b6deef6aea1f4aca5f94aa1e4f17d9cdcfd50aedb2f7266238036b622f5f33de
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F6 5456 bytes
font_01_sfnt_off00008c5b.bin
fe63e16804e564916bab13814c089dc1cda9fd41427b80bf8c553e495a9ca223
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5B 11684 bytes
font_02_sfnt_off0000b292.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 4324 bytes