Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f0be4cafcb9ef9…

MALICIOUS

PDF

45.3 KB Created: 2020-09-11 23:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1b4b7d3127a6d20c31858f875b1202 SHA-1: 36ffa23642ca500fc1d4be00f8fe379db5131c1f SHA-256: 62f0be4cafcb9ef9e519dbf2f08d85cbaca890786d972a50e7f92a79f8f93d45
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirectors or link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings, suggesting a lure to external malicious content.

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.club/wix?keyword=revit+architecture+2009+software
    • http://vaxeli.honesthomeinspector.com/uploads/1/3/1/0/131070197/8dcb1.pdf
    • http://vurake.crowncustomsandcoatings.com/uploads/1/3/2/3/132303382/daverisesigu.pdf
    • http://files.meminebrand.com/uploads/1/3/0/7/130740252/didolebas-kemusa-dilaxukiraxopop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/599026_28fcbfe3034f46bba618bc1b933951fb.pdf
    • https://static.usrfiles.com/ugd/9b5f63_e760de1d1bbc43b39046c8b0a96f4411.pdf
    • https://static.usrfiles.com/ugd/4b7290_ad1976361cd545bfa94390c6c93dccde.pdf
    • https://static.usrfiles.com/ugd/4725f1_1220b1b92f4f4dfe8d3dabe46f9e4642.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_a2164d9b457442348077ba4aa49d45aa.pdf
    • https://static.usrfiles.com/ugd/1ee69b_31b218fc3a504ae8b42dbdc28080900d.pdf
    • https://static.usrfiles.com/ugd/6cfc61_06c1dc48b848467baa5fdb30148ea76d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c241bf2bd904e6089d9dccdb7324562.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/if_second_conditional_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/16606191123.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_off00006590.bin
f178fc502106d3e71dcb3d3116da504e6b3325715618c14bdd94b4709d388c27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 5300 bytes
font_01_sfnt_off000077c4.bin
15ae5f929ece448593b321dbc122c07aef04f2e6dd205268d3110896dee4af17
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 10120 bytes
font_02_sfnt_off00009a66.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A66 4324 bytes