Malicious PDF — malware analysis report

Static analysis result for SHA-256 8240060bb25c801f…

MALICIOUS

PDF

53.3 KB Created: 2020-08-09 17:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7109d34d5d27042df22e7fe8d7cb9155 SHA-1: 655ccdca5604fa4a5c75e15e47fb05c5954625f7 SHA-256: 8240060bb25c801f81c77d8afc93ba519f83772d6f9e0f68561b6c4befbd10d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=neoclassical+literature+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the topic 'Neoclassical literature pdf' and the tool 'wkhtmltopdf', likely as a lure.

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.cc/pify?keyword=neoclassical+literature+pdf
    • http://files.katarzynasawicz.com/uploads/1/3/1/0/131069887/213760.pdf
    • http://files.katiekittrell.com/uploads/1/3/0/7/130776724/xunor_befizareb_denuzatefu.pdf
    • http://files.industrialbling.com/uploads/1/3/2/8/132815008/9011743.pdf
    • http://files.catmintcottagestreetcatrescue.com.au/uploads/1/3/1/4/131437172/2360728.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/xopusigiromulom.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2843/files/16148936449.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/92317699258.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/51871133542.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/37752983999.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/vevuripupujikiwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9191/7989/files/87109232042.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/18625184226.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/3363256027.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/titovodavado.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/95374578899.pdf
    • https://cdn.shopify.com/s/files/1/0431/1197/3025/files/pinodakegekidojarumipewa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008705.bin
46bdc00da18a903c873bfdda2cbdcba786fc1a341558288032450891362b9ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8705 4896 bytes
font_01_sfnt_off000097ba.bin
7904bda68587258733e896b2adb0df2c4df77185a7b769b6861b5a542719bbc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97BA 10088 bytes
font_02_sfnt_off0000ba28.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 4324 bytes

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