Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac199a6b48a9479…

MALICIOUS

PDF

56.6 KB Created: 2020-08-02 09:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc99893c273820bf7a36dbe9179a0571 SHA-1: a138d2e99450c9bcda163515c84107a7593968d8 SHA-256: 0ac199a6b48a94792ed3406a974e5b12b7e9685bea079aa78eb35cc6ac8a78cf
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting PDF files, and one critical link to a known malicious redirector. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the redirector link suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=starview+hct-+5808
    • http://files.sttammanywoodworkersguild.com/uploads/1/3/1/4/131482884/8246696.pdf
    • http://files.dogfriendlyrentalsonsanibel.com/uploads/1/3/1/3/131398102/b4cc89.pdf
    • http://files.sailingkenutu.com/uploads/1/3/1/0/131070116/malunad.pdf
    • http://files.asteripursuit.com/uploads/1/3/1/3/131383330/nodisatasex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/23606117755.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/zazetamezuvuresuruzupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/73555345070.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/pifajap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2103/files/16998331895.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/pirutadujiserazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2699/6633/files/40275306024.pdf
    • https://cdn.shopify.com/s/files/1/0436/0791/6707/files/45085860973.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/curl_data-_urlencode.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/59252164775.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/hal_dll_bsod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/soxaguzalerego.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/ruxofajiwuzeju.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/
    • https://cdn.shopify.com/s/files/1/0
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083a0.bin
2919ef569d44e00a8216357aeb9d57cf06bc4533d519ed871e0c288d6d0d4c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A0 3896 bytes
font_01_sfnt_off0000915c.bin
2d3e47ce5bdc090359bfe9b5533a34bededf4d4c998700931d69ed44898c0f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 5424 bytes
font_02_sfnt_off0000a3e7.bin
53e93015ad1bde546b1f62761d58a5af375858927566e633f59bf067cd265c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E7 15680 bytes

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