Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7c725a5fc8ad10…

MALICIOUS

PDF

46.3 KB Created: 2020-07-22 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: cb1fcfd2524e4e982ecec7545f11b144 SHA-1: ab5ac9072f3ec058e5d186bfe1bbd96e5aa726cb SHA-256: 0b7c725a5fc8ad10f2fef5bfa11531a090dd968eb757f46e48f9d717947b8c68
194 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to redirector infrastructure, specifically 'ttraff.com', which is flagged as malicious. The document body, though heavily obfuscated, contains keywords related to the links, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=multiprogrammed%20batch%20system%20pdf In PDF document text
    • http://files.maryhagenauthorromance.com/uploads/1/3/0/7/130740097/941d132e556.pdfIn PDF document text
    • http://files.cresaptowneagles2883.com/uploads/1/3/2/7/132740285/6627144.pdfIn PDF document text
    • http://files.websitetemplatesdesign.com/uploads/1/3/2/7/132712120/e9def052.pdfIn PDF document text
    • http://files.vgctrading.net/uploads/1/3/1/4/131438509/nusutizu-rijudigurezan.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/1/0432/9160/7190/files/mutogomesofetuwijozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/56269925624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/88945979599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/koxabibekuwerurogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdfIn PDF document text
    • https://pezufonitibi.files.wordpress.com/2020/07/64135034269.pdfIn PDF document text
    • https://tesodufow.files.wordpress.com/2020/07/13063315068.pdfIn PDF document text
    • https://keronurefaze.files.wordpress.com/2020/07/59723711299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/dejoxexejimela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/zewokobol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/60712520634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/21991092216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2532/5465/files/dotefonafofutexafotoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/31611273668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9232/9116/files/dujojitekop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/mokoxulof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/68224382843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/52317380619.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
🗂 Part of campaign: cresaptowneagles2883.com 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000777d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 5592 bytes
SHA-256: 03ff838553a12604140056856bc0db218cf472f44a410423f3478d0ceafc10b7
font_01_sfnt_off00008a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8B 9540 bytes
SHA-256: b728f4cadcd636d0de0e1bbab4d7ebb406d14852312856214b553dec85bb04bd