Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b690561a630c4b…

MALICIOUS

PDF

44.2 KB Created: 2020-07-21 02:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 83dc8a49c27948fdc7d57f6b56ef7bc8 SHA-1: e5d6b86b086127c507da553bfc7a676ef379802d SHA-256: 13b690561a630c4ba8b9180a9ec25f17377dd694f0a1577516da11ad2e58d329
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm designed to improve search engine rankings. One prominent link, 'https://ttraff.com/wb?keyword=medical%20terminology%20for%20interpreters%20a%20handbook%20pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to potentially malicious content through deceptive SEO tactics.

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=medical%20terminology%20for%20interpreters%20a%20handbook%20pdf In PDF document text
    • http://files.stewartvillecommunitytheatre.org/uploads/1/3/2/8/132815054/xotuxisazebapu.pdfIn PDF document text
    • http://files.pfrangassociation.org/uploads/1/3/0/7/130776619/9640502.pdfIn PDF document text
    • http://files.gatewayhotel.com/uploads/1/3/2/6/132695339/61a6f2a7b731a6.pdfIn PDF document text
    • http://files.apollosmartbet.com/uploads/1/3/1/6/131607662/pejapivirebo.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/1/0428/0179/1132/files/15645436424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/46244372869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/81022463550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/wujajabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/89749234483.pdfIn PDF document text
    • https://zukiner236937513.files.wordpress.com/2020/07/lalatofogape.pdfIn PDF document text
    • https://gezuduropen419134146.files.wordpress.com/2020/07/95114652612.pdfIn PDF document text
    • https://lamofozeguve.files.wordpress.com/2020/07/57998100433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/50083474771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/mifejijaxulugibiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1889/2958/files/23705927678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/75008055602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/94374174226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/wuluvujivasabidenubepej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/panepovaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/7901598747.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_off00006cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 5668 bytes
SHA-256: e09c31cc8eaca997022d87bb72b972544659b85c31fee35b53186268fba934ff
font_01_sfnt_off00007fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDC 10140 bytes
SHA-256: b505baa5b3a5f6e01f2b72dee3c5b5c49f7db8831b31466c086316435d195ba0