Malicious PDF — malware analysis report

Static analysis result for SHA-256 f764cd1335ce82c6…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 18:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32338bb47ce85902ca9fa48df255cc1d SHA-1: 7e7a6c11f18889ed566a9c0bdd0588ab29cfb08a SHA-256: f764cd1335ce82c6427e6079100276139a2d9a1b35275e23dbc24c2bfbc9fa25
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'hallelujah ukulele tabs pdf' and the malicious URL, suggesting a lure. The presence of a link farm further indicates a malicious intent to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=hallelujah+ukulele+tabs+pdf
    • http://sakijalo.regiatax.com/uploads/1/3/0/8/130874329/17941e050e48.pdf
    • http://files.thecleanandsimplelife.com/uploads/1/3/0/7/130739202/jobuvarazis.pdf
    • http://zobuwus.travelblogbylily.com/uploads/1/3/0/9/130969352/zazume.pdf
    • http://romuwexow.maternity-depot.com/uploads/1/3/0/7/130776445/jepuxeviw.pdf
    • http://files.allnaturalsoapandspa.com/uploads/1/3/1/4/131406826/7c9be378.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/24364285166.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/gateketawokib.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/cecilia_meireles_canticos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8906/8185/files/74530820705.pdf
    • https://cdn.shopify.com/s/files/1/0446/9827/1897/files/15499897128.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/ghatna_chakra_modern_history_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/12874224449.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/50997390360.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/famuwavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/dadajizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/32212927877.pdf
    • https://cdn.shopify.com/s/files/1/0447/3107/2666/files/stabilized_feedback_amplifiers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/79105814155.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/vopuduburebuvimib.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_off00007380.bin
1f2cef412ac54975ef8655295832aeec1f38e2846596c0c00d5c93bfa7494fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7380 5276 bytes
font_01_sfnt_off0000856b.bin
2259762b168e4ee5899d8fbdd9fc9110916604695acf34c19b349a772732b4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856B 15432 bytes

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