Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba3e86ebab2ede1…

MALICIOUS

PDF

44.5 KB Created: 2020-07-18 20:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4050f9d0d801429c03561514c9d93f SHA-1: ec2d6e1f7298d53ab877f0d4cf3e2e9399f604d0 SHA-256: 7ba3e86ebab2ede16daaf631739837f654f2d16b494042bf3af0e1793f500c2f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a primary goal of directing users to potentially harmful external resources.

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/wb?keyword=lajos%20zilahi%20pdf
    • http://files.blackbeerchick.com/uploads/1/3/1/0/131070520/joleje-lunoboxovip.pdf
    • http://files.ratzlaffcabinets.com/uploads/1/3/1/4/131437649/vatemu.pdf
    • http://files.brisbaneartclasses.com/uploads/1/3/0/8/130874210/dd9d11863f2e.pdf
    • http://files.operalegacy.com/uploads/1/3/0/7/130775888/jadosas.pdf
    • http://files.suppesehconsulting.com/uploads/1/3/0/9/130969624/2f229f6.pdf
    • http://files.horsesinfocus.com/uploads/1/3/1/8/131856917/todaxabav_xetiwugifobib_gaxenogisumat.pdf
    • http://files.operalegacy.com/upload
    • https://sovegobenak.files.wordpress.com/2020/07/50196426505.pdf
    • https://vogajakojoge.files.wordpress.com/2020/06/bibowofafilazewuba.pdf
    • https://lusavorin.files.wordpress.com/2020/06/pawedagatakimufozaxunus.pdf
    • https://xisomivupeba.files.wordpress.com/2020/07/wafudinosewonez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/mivurovu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/30610292786.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/kobigaguxabiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/75758165917.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/31620308938.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/62336679648.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/kafazapunobujobono.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/7792004703.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/susaladoromonezufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/59933849412.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_off00007141.bin
c26bffac3978e5143f306c8a61d5babd4bd1504c627bd55fec41bc0bfcac89ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7141 4584 bytes
font_01_sfnt_off000080df.bin
99d5c9fa8bff7fd24c9a211f9a3a1ffe5eed46ad277000f0647bb488bb39cc91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 10476 bytes

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