Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b71f69054ed80…

MALICIOUS

PDF

42.8 KB Created: 2020-07-15 20:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 73b8a327b1811007f1e9b3c91379c62c SHA-1: 31cd2889b1969eff28b7d686be6b22e8e4f239fc SHA-256: b77b71f69054ed806ce24b8d5f6f999e1fde6586359944c3f525430a7914a8f5
194 Risk Score

Malware Insights

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

The PDF file contains numerous links designed to appear as search results, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'encyclopedia of drawing techniques pdf', likely serving as a lure. The presence of multiple PDF links hosted on platforms like Shopify and WordPress suggests a link farm or SEO poisoning tactic to increase visibility of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.ru/wb?keyword=encyclopedia%20of%20drawing%20techniques%20pdf In PDF document text
    • http://files.highaspirationsapparel.com/uploads/1/3/1/6/131607522/2799114.pdfIn PDF document text
    • http://files.theazphoenixsoldiers.com/uploads/1/3/0/7/130739740/9975907.pdfIn PDF document text
    • http://files.aberdoveyswim.co.uk/uploads/1/3/1/6/131606201/e732f88344d18fe.pdfIn PDF document text
    • http://files.beautifullybrokenhearts.com/uploads/1/3/0/7/130775942/mirigelej-wixipesas-jozopolosovazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/mogujilivafobisopes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/gamekulemeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/44318620681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/22540603080.pdfIn PDF document text
    • https://vakaximez.files.wordpress.com/2020/06/36059721017.pdfIn PDF document text
    • https://kexukud.files.wordpress.com/2020/07/mitukej.pdfIn PDF document text
    • https://sifobane.files.wordpress.com/2020/07/82110883394.pdfIn PDF document text
    • https://belepajed.files.wordpress.com/2020/07/luvutoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/15970679555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/89835494909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/27426307471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/zarulewokasuvonena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/84408673682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/2036587087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/45633767895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/92593336889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/32814583339.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6882 5576 bytes
SHA-256: 5089860a9240b8c39b4b5e9be4f70b4f4bd8d258dacee8bf1ebe7cc54505e24b
font_01_sfnt_off00007b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7F 9900 bytes
SHA-256: 5da9e4ab667c12fffc1699633c5b4908f1ad75d1ab28ada2971978cf590a5e29