Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d323e86ae544f…

MALICIOUS

PDF

34.4 KB Created: 2020-08-08 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe05994eb57ab9abadd09caf2c45ec9 SHA-1: de15328df4cc30412e8ed97294b4b6c5d8e28250 SHA-256: 957d323e86ae544f90c298406ee660e30fc10c12598ca17ebd360d1952a85915
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=algebraic%20long%20division%20worksheet%20tes', suggesting a lure for educational content that redirects to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wb?keyword=algebraic%20long%20division%20worksheet%20tes
    • http://files.advancedenergywork.com/uploads/1/3/1/3/131381078/gawafebisosop_vowofi_fifob_vifuruxafak.pdf
    • http://files.rossmoynechihuahuas.com/uploads/1/3/1/6/131637374/264b70e1f.pdf
    • http://files.jd-associatesenterprises.com/uploads/1/3/1/4/131437037/lovafasan-xajawutisikef-rafob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/fe_other_disciplines_review_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/cancer_de_esofago_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/66880899194.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/xuzazolanutikivexax.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/vuwezowawilobakalinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/kimaxakuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/wezebeviweb.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/risk_of_rain_2_shaped_glass.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/35051754835.pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/category_theory_for_programmers_bartosz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/retujopitiwuk.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046a1.bin
225300743d13abc2a9b596ddb00398e0e1693dc7d860bca3da69e23dc47919d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46A1 5548 bytes
font_01_sfnt_off00005989.bin
7b3dcca1a406482fb18f2be14f8652624602f54ef49cfc444e4dfad737c98997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5989 10276 bytes

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