Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc8124a39c0663e…

MALICIOUS

PDF

53.7 KB Created: 2020-07-08 20:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 5341afb8629a66606abf03a509aa53cf SHA-1: 365fd72defc5330bd68f2f641cc41d9e5651d266 SHA-256: 1bc8124a39c0663ea200c04df13f23d2afe166740b84fac17c215175ffe676fc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a prominent link presented as a 'mock trial objections worksheet'. This link, along with numerous other embedded links pointing to PDF files, directs users to known malicious redirector infrastructure. The primary malicious link is https://ttraff.com/wb?keyword=mock%20trial%20objections%20worksheet, which is a critical finding indicating a redirection attempt. The document body, though partially corrupted, also contains many URLs, suggesting a link farm or redirection strategy.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=mock%20trial%20objections%20worksheet In PDF document text
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdfIn PDF document text
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdfIn PDF document text
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdfIn PDF document text
    • http://files.saintalphonsusschool.org/uploads/1/3/1/8/131857071/b41fba5.pdfIn PDF document text
    • http://files.seattlefirstbaptist.org/uploads/1/3/2/3/132303080/81e42db7c9176.pdfIn PDF document text
    • http://files.9roundmemphis.com/uploads/1/3/1/4/131408741/matorolepizufonigepo.pdfIn PDF document text
    • http://files.uobarchery.com/uploads/1/3/1/4/131454272/4c2c9ae42bc8a.pdfIn PDF document text
    • http://files.jovaunholmes.com/uploads/1/3/0/8/130873973/818c81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wedigari.files.wordpress.com/2020/06/wikigugik.pdfIn PDF document text
    • https://relexuxiwa.files.wordpress.com/2020/06/63181085451.pdfIn PDF document text
    • https://tixobumot.files.wordpress.com/2020/06/vowedojigonerezozew.pdfIn PDF document text
    • https://womazujixix.files.wordpress.com/2020/07/52731000774.pdfIn PDF document text
    • https://tukujefarepe.files.wordpress.com/2020/07/sasidolewun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.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_off00009632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9632 5052 bytes
SHA-256: 5c6c41ba766ef7ea806d6a2f65bcbf675eb2484589cf16af9dd18bea36e574d3
font_01_sfnt_off0000a75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA75D 10088 bytes
SHA-256: e2c6a984a0db44cf74bac4bac25f89ddfedf031a8128aff0020fd1355825021c