Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5efa4b683651ca…

MALICIOUS

PDF

36.0 KB Created: 2020-08-30 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59f7244e1fa4cfd2e808872315f1a40d SHA-1: 6f1756e82feeed45984abdd6a41e78d24b3799f6 SHA-256: 6f5efa4b683651ca8cf1ee3621d9f1e6acf6881e67b372df42eb3e91d6c4e097
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to "phones on sale" and the malicious URL itself, suggesting a phishing lure. 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.cc/wix?keyword=phones+on+sale
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_48ec684d3f1248b9b2c7d97761c96360.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c6e15a2bbb44e0960c249ea6c64255.pdf
    • https://static.usrfiles.com/ugd/921909_55a9f82030a14d3797d676fff0d7c8ca.pdf
    • https://static.usrfiles.com/ugd/e5a943_6ac1814965254e718ab2a5e200051149.pdf
    • https://static.usrfiles.com/ugd/0df15e_74b35c9862ab4cf6a22fd131ff958392.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_51ccc0bc9c3d41f2b2fa7e117cddb6e1.pdf
    • https://static.usrfiles.com/ugd/c63dba_d66e5e9b23434be2afbe290440f16496.pdf
    • https://static.usrfiles.com/ugd/07ef24_e676ec8c443d40299a66e8caa73a5d42.pdf
    • https://static.usrfiles.com/ugd/c1108c_4e9fc862fd964bcbabaa0e294bfb6bc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d00b330d89e41bbb84a22664eb146c1.pdf
    • https://static.usrfiles.com/ugd/41f880_4d96fa699bcf459298dedac12ffd39d1.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/xavujosogikanixo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/romadipe.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_off000044ab.bin
dd186c358a7c2f7a27eecbb8331b198a03a9e3f54d9c386ab3e292435fe13b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x44AB 4340 bytes
font_01_sfnt_off00005346.bin
96ee52759118bdf1eeb10b9d1b2a15ff9c4702a7ea896ec3f27f56482e5ef6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5346 10284 bytes
font_02_sfnt_off000075c4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C4 4324 bytes