Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ecdf409f9322e2…

MALICIOUS

PDF

53.8 KB Created: 2020-07-13 21:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 5a9db674b265ac98a203263fcaefc4d9 SHA-1: 0a37be0ab1d847e7b3dbd733e234f6c71780eb83 SHA-256: 91ecdf409f9322e2e0a4cfec0411464c623af3b3ac31448f783d3bb845512ffe
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.cc/wb?keyword=fujifilm%20xf%2018-55mm%20manual', points to known malicious redirector infrastructure. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its intended lure. No scripts were extracted from this sample.

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.cc/wb?keyword=fujifilm%20xf%2018-55mm%20manual In PDF document text
    • http://files.whitemtncommunitycoop.com/uploads/1/3/0/7/130739517/gimikisaxer.pdfIn PDF document text
    • http://files.bootedmiles.com/uploads/1/3/1/4/131438468/5428990.pdfIn PDF document text
    • http://files.alibarker.com/uploads/1/3/1/4/131438150/zijujekeb.pdfIn PDF document text
    • http://files.hskofc10502.org/uploads/1/3/0/8/130814227/kapupusufeledobosuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vimavabe.files.wordpress.com/2020/06/magolatinimexomikobisufa.pdfIn PDF document text
    • https://guxefem.files.wordpress.com/2020/06/57967179736.pdfIn PDF document text
    • https://nelagudisuz.files.wordpress.com/2020/07/68855115007.pdfIn PDF document text
    • https://rupiwenete.files.wordpress.com/2020/07/59492800925.pdfIn PDF document text
    • https://kijukadolok.files.wordpress.com/2020/06/tibewevuwivojefav.pdfIn PDF document text
    • https://tatokarisifo.files.wordpress.com/2020/06/51569919988.pdfIn PDF document text
    • https://lafukaraziba.files.wordpress.com/2020/06/70393988382.pdfIn PDF document text
    • https://busamonavek.files.wordpress.com/2020/06/99575572423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/75795175149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/84592259603.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/jotovodamapuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5603/7016/files/juzerozosakewuwumidiwadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/vejowagudupofut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/65304756448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.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_off0000949d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x949D 4716 bytes
SHA-256: 180942db81e450e4e993fc516596352a302cd4555fde31f47f18fe4f830fd970
font_01_sfnt_off0000a492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA492 10872 bytes
SHA-256: b861111e176e0b88b16b210ca5ef7d3a9e8c5111c6547cf22b5a9645757bed06