Malicious PDF — malware analysis report

Static analysis result for SHA-256 55094b66119fabc0…

MALICIOUS

PDF

38.9 KB Created: 2020-08-14 23:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10328005530ea501276fc8411024d3e SHA-1: 50517f59c85f40ae72b5d3137efbee39d46c503b SHA-256: 55094b66119fabc0a245b2c7e0e73bf9e77331c4371853cc418274570f747b20
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 of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=fractions+to+percentages+worksheet+ks2, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to fractions and percentages, suggesting a lure to disguise the malicious intent. The presence of numerous external links and a malicious redirector indicates an attempt to lead the user to harmful content.

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.ru/pify?keyword=fractions+to+percentages+worksheet+ks2
    • http://files.unwrittentimeline.com/uploads/1/3/1/3/131379246/tilad_zamejomiwudoz_tifawusolo.pdf
    • http://files.montanasavannahcats.com/uploads/1/3/1/4/131454352/kujekaropimuzos_tijaxatived_vivaduwilewumo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/71161702561.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/58589845289.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/ritefojij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/48322413039.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/mipilaxesonig.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/fitipuseg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/pdf_el_neoliberalismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/wawizixonavifabulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/57092316090.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/sizojaluvexolatoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/agentur_fr_arbeit_arbeitsbescheinigung.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/vumoxexivesedutiwopelala.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_off0000597b.bin
0a22a0dd5019641979366f9fddba756df475df999e2c0ccc36defc1beacf8fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597B 5408 bytes
font_01_sfnt_off00006bf1.bin
cfe7ccde65f1d5097bc642062bd09b25f2e9d4c626d2598b802c1971e0e6134c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF1 10208 bytes

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