Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a6226a9cdd38c2…

MALICIOUS

PDF

41.6 KB Created: 2020-09-11 08:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d82cda87f829f3c165d7fb4d53f7fe SHA-1: f6255ea2a7da74e0a1c6b2ce965cbe5e15af9261 SHA-256: 34a6226a9cdd38c2fec48fc7f09bd4ceb74acbbee384294e5feaaf7a4ad7a189
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to 'Adding action bar android studio' and includes URLs that are likely intended to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.me/wix?keyword=adding+action+bar+android+studio
    • http://files.bcmgaohio.com/uploads/1/3/0/7/130740429/xubunikuf-jadisiroxeza-memuful-tusotaji.pdf
    • http://files.wpnaturespa.com/uploads/1/3/0/7/130740297/04df6dd1ca5b4.pdf
    • http://kobod.moxyithaca.com/uploads/1/3/1/4/131437130/ruxixotisol-bixatutuzurumex.pdf
    • http://vuxopad.medtechwearables.com/uploads/1/3/1/3/131379730/7769098.pdf
    • https://static.usrfiles.com/ugd/880a7e_a311fbd8784f4479ab2ef98d6eb2e89a.pdf
    • https://static.usrfiles.com/ugd/fc3b0b_7708db1b03834b19a8f5ceece8781743.pdf
    • https://static.usrfiles.com/ugd/739437_7518253be15546aa892365c2a0372ebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/xamuloworetikuni.pdf
    • https://cdn.shopify.com/s/files/1/0437/8342/2109/files/47290999408.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/zenebiganarepa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006311.bin
bb31bba5a7bd3f41aa5179a5298d61ec75580696b0d17c4a223fcf27c9e11725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 5204 bytes
font_01_sfnt_off000074cd.bin
e0b5dfdbfb92906ab23dde79bdf4f7de5d6ce75ab04a3645c9ac5de0553a560f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 11056 bytes

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