Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dc4e44fb949675…

MALICIOUS

PDF

43.7 KB Created: 2020-08-22 15:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5f1b1da0631147d6ed02c549fe3a7d SHA-1: 1b8ab902e01a131c1bcb801ed8f1949849ac4c1f SHA-256: 78dc4e44fb94967548661e4030ab0400c7504c3a58c40bfc35d629d64be86a27
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM, indicating a link farm. One of these links, https://ttraff.com/pify?keyword=how+to+clean+boll+and+branch+sheets, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though garbled, contains the same malicious URL, suggesting an attempt to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=how+to+clean+boll+and+branch+sheets
    • http://files.toaelectronicsusa.com/uploads/1/3/1/4/131453214/acb8f5215f1bb.pdf
    • http://jibevi.instafiltersstory.com/uploads/1/3/0/7/130738850/raduz_parupak.pdf
    • http://files.basalhospitality.com/uploads/1/3/1/0/131070845/babejepimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/8135/9520/files/misinexabosoweki.pdf
    • https://cdn.shopify.com/s/files/1/0450/1169/7814/files/edgar_allan_poe_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/australasian_lawyer_innovative_firms_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/wikewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/concrete_batching_plant_operation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/cepheid_genexpert_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/fevokateleguwupuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/88920795338.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/19519151956.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/26690550358.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d39.bin
4bc826b0411a0ba6354b04ec6b355ed2b1de1d8a8b39164c91822a5d7bcffe5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D39 5220 bytes
font_01_sfnt_off00007ef0.bin
9b5c30796870fe64037d3bf067a9058f2632d11e2ba1eeacabed5c396e6b2b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 10252 bytes