Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918d42f7743afa1…

MALICIOUS

PDF

62.7 KB Created: 2020-08-04 23:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f50b79f6a6677eb8fcb9f0e355174a28 SHA-1: 0e486906341d0639cf48ef5b060260587bf8323a SHA-256: b918d42f7743afa19af2b5383262af962efc5d7f4c92429d79552d99f2e7d48e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=aminoacidos+de+cadena+ramificada+deporte+pdf', points to known malicious redirector infrastructure. This suggests the document's purpose is to lure users into clicking malicious links, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=aminoacidos+de+cadena+ramificada+deporte+pdf
    • http://files.newarktherapeutic.com/uploads/1/3/1/3/131383247/12fe6aaa.pdf
    • http://files.rhizolab.com/uploads/1/3/2/7/132710601/3140281.pdf
    • http://files.waisolutions.com/uploads/1/3/1/6/131636984/xegaku_wurini.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/13507007589.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1537/files/bigab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5412/0606/files/lekikoxuzeweruma.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/21047500319.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/xubebuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/nivexukajus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/favasubesuxuxasifekexevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/66780638973.pdf
    • https://cdn.shopify.com/s/files/1/0439/5309/4811/files/bafudipanidebodax.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/nabopidenifumododululira.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/mapeninijuzapituri.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b333.bin
a49f4f4c1f50e0664b962efc63d0d9bc535fb7b43857a04443b30e780f0d108b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 5260 bytes
font_01_sfnt_off0000c4f9.bin
ef90f1d76fdbc9677d5440dfc7c11f10a847cce192feec38c8d567fa8cea814b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 12140 bytes