Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a3ea01190d74ef…

MALICIOUS

PDF

48.3 KB Created: 2020-07-26 16:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d844692c1292345c62c504069c9bb771 SHA-1: 6ac2548004070729c4aa0851f4980e0bcd2f164b SHA-256: f5a3ea01190d74ef0f61210caa014c735b2b4b4b84f72786ab6197422145e782
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to financial performance reports. The presence of numerous external PDF links, as indicated by 'PDF_SEO_LINK_FARM', further supports a malicious intent to drive traffic to potentially harmful sites. The ML classifier also strongly indicates 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.com/pify?keyword=financial+performance+report+sample
    • http://files.grantbomberbarker.com/uploads/1/3/0/8/130873984/77822e87fe5.pdf
    • http://files.bobswanderings.com/uploads/1/3/0/7/130775503/talozekozelififiwebu.pdf
    • http://files.win19.org/uploads/1/3/0/8/130814296/7724866.pdf
    • http://files.bobswanderings.com/uploads/1/3/0/7/1307755
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/xovigeduloluwezevet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/gagomot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/29100197213.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1543/files/83046245074.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/ledamamejisulodiranazapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/7987010183.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/vofede.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/58677160022.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/demoxoxizoman.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/56118255977.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/74844657771.pdf
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/gowumew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/13578847969.pdf
    • https://cdn.shopify.com/s/files/1/0431/9716/9824/files/90844861033.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_off00007e74.bin
78eb5adb7edb2469ba753e1f9f8b64a69b90ba9461317c496882f705420954e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E74 4904 bytes
font_01_sfnt_off00008ef6.bin
b51a380b272f21a39378c7fabf32a9c0aefa67f6e8117345b4b52eb286fcf7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF6 10776 bytes

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