Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a7de51441a7b8f…

MALICIOUS

PDF

45.3 KB Created: 2020-08-05 05:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9719be33389a29ba9fbff9f044069fb0 SHA-1: eebb91a49d748e2d66fd209925e0d427aec8276a SHA-256: a6a7de51441a7b8fed06b719f0dde9f404b6ebc6b6b77b38e8edea96d813db88
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains hosting PDF files. One prominent link, 'https://ttraff.cc/pify?keyword=autism+screening+test+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into visiting malicious sites under the guise of an autism screening test. 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/pify?keyword=autism+screening+test+pdf
    • http://tuvak.onondagacommunitychurch.org/uploads/1/3/0/8/130814328/bedujowizawepi.pdf
    • http://files.cococollections.net/uploads/1/3/1/0/131070483/1722951.pdf
    • http://dozaz.isaiahgruberphd.com/uploads/1/3/0/9/130969465/lukogakekepowu.pdf
    • http://files.ciremaitrail.com/uploads/1/3/0/7/130740596/najiremi.pdf
    • http://pimireb.starwarsjournal.com/uploads/1/3/0/7/130738970/dae29.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/tipumujiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/vufobegafare.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/goxukotifoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/xitenozisazulev.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/35219906160.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/28068970705.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1932/files/69881053952.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/51341036658.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/89414525404.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_off00007238.bin
a8f5795b08ddd25f794548ad7994f5d054484b1aff24df49a8d004eeae691cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 5224 bytes
font_01_sfnt_off000083ee.bin
db8177911daf652b870d3e61e905e1a6ded642aafda2bfad5ebf583d5ee520b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EE 10836 bytes

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