Malicious PDF — malware analysis report

Static analysis result for SHA-256 a725b5c5134f09b0…

MALICIOUS

PDF

54.2 KB Created: 2020-07-17 03:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 50da408fefdd08fb51f62fe59321ebe6 SHA-1: d61f21086cb3b76c93b0e71d9d2cf81349d4d2ca SHA-256: a725b5c5134f09b0c2470778b1b33e5bcb066c490bddc92143ba3d250243dc7c
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL, 'https://ttraff.com/wb?keyword=application%20letter%20example%20pdf', is identified as a malicious redirector. Another heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0432/6083/8050/files/gigatuvatan.pdf' being one of the linked PDFs. The document body, though heavily obfuscated, appears to contain metadata related to application letters and PDF generation, suggesting a lure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=application%20letter%20example%20pdf In PDF document text
    • http://files.charlevilleperformingarts.com/uploads/1/3/0/8/130814337/domireliwafutodej.pdfIn PDF document text
    • http://files.twohandsrescue.org/uploads/1/3/1/4/131407877/18d68b9c.pdfIn PDF document text
    • http://files.coolmedicalspa.com/uploads/1/3/2/6/132681210/7482581.pdfIn PDF document text
    • http://files.artslcc.com/uploads/1/3/0/7/130776142/32ae9a02.pdfIn PDF document text
    • http://files.thebody-mechanics.com/uploads/1/3/0/7/130775752/rajodawudezete.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/1/0432/6083/8050/files/gigatuvatan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/42382750482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/2440530060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/64226830991.pdfIn PDF document text
    • https://kojesurobiza.files.wordpress.com/2020/06/banofunifarivaroromiji.pdfIn PDF document text
    • https://jurovofat.files.wordpress.com/2020/06/74467692418.pdfIn PDF document text
    • https://robepeler.files.wordpress.com/2020/07/gowuguvat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/71520421160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/vavojojotegox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7854/8630/files/56775874758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/47235144539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1307/8174/files/31019610487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/mejizelomerelunorotuwuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/23340907916.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_off0000960a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960A 4968 bytes
SHA-256: d789435ab0fa9a8f3d0c001b839253e9df532781a3b9d6ed8d565dfef6771754
font_01_sfnt_off0000a6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CC 10612 bytes
SHA-256: 0bac7bbd4b4d30552a9a5245d0c461c3a2ea64451caf9e41efa24085c1801236