Malicious PDF — malware analysis report

Static analysis result for SHA-256 62461688a8fe294c…

MALICIOUS

PDF

43.3 KB Created: 2020-07-31 07:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0266b64d0d06a57cc4ee9445f6c0469 SHA-1: ed8e26d8727b1843d217b6675315bc93470495c2 SHA-256: 62461688a8fe294c54d4db52a4295e0f148a34137f79c201b11aa1f1d4784bd7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with the primary one leading to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'La valse d'Amelie' piano music, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the link farm heuristic point towards an effort to direct users to malicious infrastructure.

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.ru/pify?keyword=la+valse+d+amelie+piano+noten+pdf
    • http://files.chantolaspinall.com/uploads/1/3/0/7/130775551/lulusap-sonirap.pdf
    • http://files.fourthmoonmusic.com/uploads/1/3/2/7/132741225/7c5c95931736a.pdf
    • http://files.baragisladottir.com/uploads/1/3/1/4/131437792/nipunobolepebez-magizob-zutodilaniram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/84959254512.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/40752094209.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/tixonivufoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/30918340146.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/40394676976.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/98010281957.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/kaxebugawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/rizulitedifil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/vimobowuzo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6435/files/kidisepejofewudufaxaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/83565738402.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0d.bin
d762da703b91deaf019f40681de4fe001169e0d8c7622dc2821502c597e38a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0D 4880 bytes
font_01_sfnt_off00007b99.bin
8ea23a10245bbafe14ae8e2089d853e22bc1bd7a4e04c46c5fc34b5e9025116c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 11020 bytes

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