Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d514bb574a712…

MALICIOUS

PDF

37.3 KB Created: 2020-08-30 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c855b25ae74c7ce3c327d2f5c12b0d SHA-1: 006013637d25c92c8c7f7015ebe4db9ffeb38aa6 SHA-256: 055d514bb574a71225888f76d4f9e6a56362dce9529d056d941bdc5edd12072c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or host a large number of external links. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a phishing or redirection attempt.

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=momentum+and+impulse+worksheet+solut
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/69b86f_b133c6998d51414ba4849b0e3477c86a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67cc1a50274440aa9e2f9275bacda63.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dccb9b98fc04a7bb503fab77e2589b6.pdf
    • https://static.usrfiles.com/ugd/6da380_9ed56af458564973853f347e3f8ae254.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5223/files/cerebral_amyloid_angiopathy_patient_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/android_network_application.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/murigutibujemavubavap.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/rufifojozusinef.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5fdf1e2391744ed851fe6f5b12bb720.pdf
    • https://static.usrfiles.com/ugd/3cb679_1cc4094133224caaa65c9366ad8cb2b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5923b805eb664552976164a5048134d4.pdf
    • https://static.usrfiles.com/ugd/87b9a8_05f39084ad8b473fa169a6fbbd3df782.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e91a634fb4d42afa64c2b9967012a9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ca98d220124fa3a1cbac718eb95ff2.pdf
    • https://static.usrfiles.com/ugd/40512e_5a928419e0e14fda92855b02b3837d4a.pdf
    • https://static.usrfiles.com/ugd/c3548c_03baa856c3f64044b31c05c1041275fd.pdf
    • https://static.usrfiles.com/ugd/804ff6_4b7e83ced46345479e243e0d248300ca.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d9b.bin
e2a2986ab94f0106a43be653af4d1d4cc40b4eb4cd9cbaa3677b886194da88a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9B 5360 bytes
font_01_sfnt_off00005fba.bin
4af95cb6f7fa24d7e58a01a881499ae0635c150a01c830c0ed81f15f18913fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 12908 bytes

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