Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a8fcc796dbf525…

MALICIOUS

PDF

36.4 KB Created: 2020-09-18 09:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2fbfa6ac8175c68fe3afb86fe0d65a8 SHA-1: 696c9848d91f3c3b2122160d498b1e4c00eb49cb SHA-256: 70a8fcc796dbf5251dab1591f73eaf53c19cfe9e893e6ec58e722dfaffe31dd2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors or known malicious infrastructure, indicating a malicious intent to direct users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malicious redirection attempt.

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.link/wix?keyword=beaver+falls+county+park+mn
    • http://files.pcricecream.com/uploads/1/3/1/3/131398424/fafakaberozidojuriz.pdf
    • http://dafagal.fallyscare.com/uploads/1/3/2/6/132695384/b585d1.pdf
    • http://files.nyccbtp.com/uploads/1/3/1/6/131637218/peligus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7be5e3f-0396-482c-a9b5-bccfad4f0a6c.filesusr.com/ugd/b81754_027ab5559846442ca3a50c7e037ed5ba.pdf?index=true
    • https://693e554f-0815-4f0d-9460-2062a67d1cc4.filesusr.com/ugd/c4f63d_20415be7ee11426ca5185b2c3f798735.pdf?index=true
    • https://9ebcda41-9689-48f1-9c6f-76b864e079de.filesusr.com/ugd/df7b34_5480ae31a7e8405ea6eebe4e67bcd32d.pdf?index=true
    • https://2128b826-1af4-42f0-80c2-651cca9e3b3a.filesusr.com/ugd/270e53_b03037eb7a90437692cdd0a364b398c4.pdf?index=true
    • https://bcd982e7-4cdc-4fd3-8a5b-e42b2e5078f7.filesusr.com/ugd/ce4b7c_c74404a22325410bb9370c9529b5d2eb.pdf?index=true
    • https://93ad21cb-efea-444f-878a-1e66b19a6071.filesusr.com/ugd/2074c9_a81236cf37924b30b77f4f64cb2f1049.pdf?index=true
    • https://c6aba63c-cd92-48f1-af5a-ebf9911a14a3.filesusr.com/ugd/409ca8_606a1a4669e0440887226d5b3a2e674c.pdf?index=true
    • https://7158eb19-e31a-482f-844f-6ecee9737dc2.filesusr.com/ugd/cd81e9_4e707a403d6140ebabf4e4b6179f9a71.pdf?index=true
    • 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_off00004636.bin
ac6a44c871ea4f7ad54d9d179c62c7777db3bf284d7186a198d075341c7ca102
pdf-font-stream PDF embedded font (sfnt) at offset 0x4636 5436 bytes
font_01_sfnt_off000058b5.bin
9337945f7bf0bc97866f4791f0554877be2243cb2b8711a067990700fb18a6c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x58B5 13848 bytes