Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c024631a149724…

MALICIOUS

PDF

66.4 KB Created: 2020-07-10 15:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 0204a1bf72cded48e116024a9224c6da SHA-1: 906f2fe2e90dc8145c13918661a834ebe4bdb1b8 SHA-256: 57c024631a149724b2d94255f2763ff0fca7e1b024076cd864b06a14e30e0063
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a malicious redirector link disguised as a dictionary download, which is a common lure for phishing or malware delivery. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a coordinated effort to distribute malicious content. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of 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.cc/wb?keyword=cambridge%20international%20dictionary%20pdf%20download In PDF document text
    • http://files.hopeandloveministries.org/uploads/1/3/0/7/130738889/8508838.pdfIn PDF document text
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdfIn PDF document text
    • http://files.thegreenpoodle.com/uploads/1/3/1/3/131380754/458259.pdfIn PDF document text
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdfIn PDF document text
    • http://files.victorkumar.org/uploads/1/3/1/6/131637919/jilofa_pevajuxaja_jepes.pdfIn PDF document text
    • http://files.angelageddes.com/uploads/1/3/0/7/130739120/judekurexivevugar.pdfIn PDF document text
    • http://files.appalachiandriving.com/uploads/1/3/0/7/130776575/kibulixagixeni-ridipako-guvugasufi-wukem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ligevuxev.files.wordpress.com/2020/07/62933999395.pdfIn PDF document text
    • https://xasarev.files.wordpress.com/2020/06/sinotobesuler.pdfIn PDF document text
    • https://modunupiledu.files.wordpress.com/2020/07/visawegitabalej.pdfIn PDF document text
    • https://dafadexur.files.wordpress.com/2020/06/gogidaw.pdfIn PDF document text
    • https://dakepobuvil.files.wordpress.com/2020/06/fukevot.pdfIn PDF document text
    • https://xinewilo.files.wordpress.com/2020/06/podevegazosokemik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/14176488971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/resukuwovubuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/42020073059.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6283 15536 bytes
SHA-256: c8ebe5e7d1b4e4ddb560594e34d465d5f27b0b1d99801c5eff1cbc0a791b79c4
font_01_sfnt_off0000950d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950D 5444 bytes
SHA-256: 5654cf2b96af85c7e0ff6d7923c110be1e92d4dd862b84138bb2a4a3e0a4a547
font_02_sfnt_off0000a791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA791 16256 bytes
SHA-256: 6a493fda8b7548c1999e84dd3c0e6e3760e69c92e0467109e8be2190bf8be62c
font_03_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 19264 bytes
SHA-256: 821024dcae0bd0005d85a3909e99575951459e0c4eb03fe35f66f6ea6f63827a