Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf0c8476f4e7fb4…

MALICIOUS

PDF

34.8 KB Created: 2020-10-13 00:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 256cc34d232644600398b770dc7fe62d SHA-1: 3ccd17a9f7be3af0da542c8a6b7504489d1e9517 SHA-256: abf0c8476f4e7fb43934a4b83cc166ab1b91c8acc670842d695c1edf2b196799
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on disposable domains, a common tactic for link farms and SEO manipulation. One of the primary links, 'https://gettraff.ru/strik?keyword=download+lightshot+for+android', suggests a lure to download an application, potentially leading to malware. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of malicious redirector links and link farming.

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://gettraff.ru/strik?keyword=download+lightshot+for+android In PDF document text
    • http://files.kptluxuryresale.com/uploads/1/3/2/8/132816160/8883072.pdfIn PDF document text
    • http://files.awakenoneness.com/uploads/1/3/1/0/131070792/ad0f862.pdfIn PDF document text
    • http://files.disneyvacationvilla249.com/uploads/1/3/1/0/131070284/76a3a17.pdfIn PDF document text
    • http://toviwo.highlandtigers.com/uploads/1/3/1/4/131406840/2346842.pdfIn PDF document text
    • http://zebubu.thenewdigatearms.com/uploads/1/3/1/4/131437299/f5119fd5e86.pdfIn PDF document text
    • https://site-1042619.mozfiles.com/files/1042619/porowizibakif.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/80166424432.pdfIn PDF document text
    • https://site-1038856.mozfiles.com/files/1038856/31219454718.pdfIn PDF document text
    • https://site-1039349.mozfiles.com/files/1039349/19757330478.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/1/0482/2345/3341/files/nimitz_elementary_school_kerrville_tx.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1418/3323/files/56363027331.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_off00004bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD9 5260 bytes
SHA-256: aca1c6ee959286490ef55723d5bd29b0cd9cb3da9c5d703208c7f7b87a790cec
font_01_sfnt_off00005dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 9652 bytes
SHA-256: 5c48e1d93fa63b7cd65e236e32772f992b47c1abeb53c79b10023d656a72ffad

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