Malicious PDF — malware analysis report

Static analysis result for SHA-256 023a97fc4a2a946c…

MALICIOUS

PDF

41.3 KB Created: 2020-07-29 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fa3ba5e27e78f4f699ec6d7c8d9d0f SHA-1: 50707353273e56d79fe74a5688e0d5ed5d1191a8 SHA-256: 023a97fc4a2a946c5af3e7dea033e1941df1857173a3bce74665ac29af92dcd7
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, a significant portion of which are hosted on Shopify and appear to be part of a link farm. One embedded URL, 'https://ttraff.ru/pify?keyword=bendito+jesus+acordes+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and likely intended to mask the malicious intent.

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=bendito+jesus+acordes+pdf
    • http://files.sacramentomarriagecounseling.com/uploads/1/3/0/7/130739392/mofag.pdf
    • http://files.glennmehrbach.com/uploads/1/3/0/7/130740011/7722565.pdf
    • http://files.elsewheremusic.net/uploads/1/3/2/6/132681851/4250121.pdf
    • http://files.banerjeesharmistha.com/uploads/1/3/1/4/131455475/xukemoneseduf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/bonuwamuxoluzoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/denapiwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4495/4527/files/refuserik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/54095368306.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/72239020915.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/91266845221.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/waminobanixufelozabezerub.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/senisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/16435119179.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/99161419295.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_off00005c0b.bin
27618f1a5fd6bdee53c2d6186e5916c407e7668ec31235a3acc8c4016516f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0B 5124 bytes
font_01_sfnt_off00006d86.bin
0d41912a43fe04f9a2209e895cb1b26dcaba7ff2d3b3cbb4f2223d402166bfec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 13756 bytes