Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a558299e1ac423f…

MALICIOUS

PDF

43.5 KB Created: 2020-07-10 11:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 680cb01c2b8121f7e396d0ebe9ec2840 SHA-1: 932b4da75bfdf90d03fe326e9801675e941c1393 SHA-256: 6a558299e1ac423f04d80fac786013c012d48cbd896a52dfc9e52fc6fc799973
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external PDF files, many hosted on disposable domains, indicating a link farm or SEO poisoning attempt. One of the initial URLs, https://ttraff.com/wb?keyword=foot%20and%20meter%20in%20poetry%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, potentially leading to malicious content or further compromise.

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=foot%20and%20meter%20in%20poetry%20pdf In PDF document text
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdfIn PDF document text
    • http://files.tennissukses.com/uploads/1/3/0/9/130969775/b574bb103f3951.pdfIn PDF document text
    • http://files.neonopen.org/uploads/1/3/2/6/132682293/dc75c.pdfIn PDF document text
    • http://files.emergingpaintinginvitational.com/uploads/1/3/1/4/131407035/3041218.pdfIn PDF document text
    • http://files.healingneck.com/uploads/1/3/2/3/132303312/semejivabuzew_lefadowopidixe.pdfIn PDF document text
    • http://files.marandihostetter.com/uploads/1/3/2/6/132680932/lowudubolado.pdfIn PDF document text
    • http://files.sandrabekvalac.com/uploads/1/3/2/6/132682848/ed935e58d3f1.pdfIn PDF document text
    • http://files.toris-pinkribbonjourney.co.uk/uploads/1/3/1/6/131636651/nupulunasolot_vewukumomogifes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tawufeje.files.wordpress.com/2020/06/15739746904.pdfIn PDF document text
    • https://ditumofi.files.wordpress.com/2020/07/43438262274.pdfIn PDF document text
    • https://dodifoji.files.wordpress.com/2020/06/pagukutol.pdfIn PDF document text
    • https://mulovutizupi.files.wordpress.com/2020/07/mewawabalulinamosinirimew.pdfIn PDF document text
    • https://pavumowe.files.wordpress.com/2020/07/11194966539.pdfIn PDF document text
    • https://jisimefadew.files.wordpress.com/2020/07/24155802373.pdfIn PDF document text
    • https://nojowijede.files.wordpress.com/2020/06/98337170305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22537170944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.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_off00006984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6984 4820 bytes
SHA-256: d09b4ffe68541be4ff47c9b37fa0069f765cdfa7cb8b076786a0113d687775ef
font_01_sfnt_off000079d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 11976 bytes
SHA-256: 83619ff27f663123a5eff5a178b94548f8a11ca57ffe27ca9486cf96d0e12eb2