Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b226dc90d099eb…

MALICIOUS

PDF

42.6 KB Created: 2020-07-21 21:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 6d05a56c1a0082ac57c1931aa6cd4d30 SHA-1: bf82efc95f22e499a2bfd458764e7e909445a1fe SHA-256: 27b226dc90d099eb8a5c8f19a543213f8f34d7cae1b08ce2228d61e34dad69d1
234 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One of these links, 'https://ttraff.ru/wb?keyword=papercraft%20car%20pdf', is flagged as a malicious redirector. The document body is heavily obfuscated, preventing a clear understanding of its intended content, but the heuristic firings strongly suggest a malicious redirection attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=papercraft%20car%20pdf In PDF document text
    • http://files.westfieldhighschoolgirlsicehockey.com/uploads/1/3/1/4/131483445/wosokizinewa.pdfIn PDF document text
    • http://files.odetteblacklock.com/uploads/1/3/0/8/130874266/gixobejodu.pdfIn PDF document text
    • http://files.bonejourdoggiebandb.com/uploads/1/3/1/8/131856232/2911487.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/1/0435/5633/9861/files/85071375322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2830/6330/files/gowonifilaresigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/nudus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/51467293294.pdfIn PDF document text
    • https://kijovez.files.wordpress.com/2020/06/99093155314.pdfIn PDF document text
    • https://fegiduv.files.wordpress.com/2020/06/505513863.pdfIn PDF document text
    • https://gosijanasi.files.wordpress.com/2020/07/89837739109.pdfIn PDF document text
    • https://fijimisu.files.wordpress.com/2020/07/23531416095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/23576531299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/fowiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/83798822319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/foxiwekukixidugebebulopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/vegebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/91689829989.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_off00006c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8A 4464 bytes
SHA-256: 5789910ea74ea813091ffafdbb16c24f19d6abe688a11ad3a080c8dcc081dd63
font_01_sfnt_off00007bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBF 9892 bytes
SHA-256: fa8542f5c586a1d57ff6f06df2bea0e66292a1a76334d05eef06091702e68019