Malicious PDF — malware analysis report

Static analysis result for SHA-256 8652cf572e218789…

MALICIOUS

PDF

49.5 KB Created: 2020-07-23 05:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 9124a0274483b58e1a42c1c74a9cca67 SHA-1: b4cd7738ce2184c63434b008b1cca7ca13f75eac SHA-256: 8652cf572e2187894a45db937ecd43b41d315c9b467d01bd08599a46ea327171
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links designed to appear as legitimate downloads but redirect to malicious infrastructure, specifically a known redirector. The document body, though heavily obfuscated, suggests a lure related to calendars. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or scam attempt.

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=kalender%202019%20zum%20ausdrucken%20ohne%20pdf In PDF document text
    • http://files.themerchantsguildstore.com/uploads/1/3/0/7/130738918/bujakitujexilokosodu.pdfIn PDF document text
    • http://files.coffeetacoffee.com/uploads/1/3/0/9/130969065/2041573.pdfIn PDF document text
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdfIn PDF document text
    • http://files.craniosacralsydney.com.au/uploads/1/3/0/7/130739837/dekifirimozim_piturilub_jegow_goxoxaxuzu.pdfIn PDF document text
    • http://files.difficultjet.org/uploads/1/3/2/7/132740375/puzilazunup-gulesirosolene-bebatib-wusebi.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/1/0435/5856/8097/files/retujadajelexebirideju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/8615476085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/74720159251.pdfIn PDF document text
    • https://vipewudubeg.files.wordpress.com/2020/07/wofenovivokelab.pdfIn PDF document text
    • https://morureni.files.wordpress.com/2020/07/tozufawoxejexu.pdfIn PDF document text
    • https://bekururumema.files.wordpress.com/2020/07/80651539087.pdfIn PDF document text
    • https://lirapirabemo.files.wordpress.com/2020/07/62662335202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/21161907075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/zifaragas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/winipuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/22580370354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4438/6454/files/xolegesuvekeku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/90816738803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/zelag.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_off00007dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD4 5712 bytes
SHA-256: 24793daa3950d01ec4cf5fbc4d35b6b34e4993ade36bd245e39f09972879b5aa
font_01_sfnt_off0000911b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x911B 11736 bytes
SHA-256: f79205445eeeda4f875b9c9890b011ce520d9c747e1695b39fe67e35d03de173