Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b0dc653ca5de1…

MALICIOUS

PDF

58.5 KB Created: 2020-08-30 04:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d952181cd7d704b1b09afff5925430 SHA-1: cb660a33d7b232dd92ad5e8a009b2c269cd60ad5 SHA-256: 1c8b0dc653ca5de1012d4d375c2b1e701ae3a2e41f822115da1454af568e03b0
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://ttraff.ru/wix?keyword=the+strange+case+of+dr+jekyll+and+mr`. The document body appears to be obfuscated or corrupted, but the presence of numerous external links, many pointing to Shopify domains, suggests a link farm or redirection tactic. 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.ru/wix?keyword=the+strange+case+of+dr+jekyll+and+mr
    • https://cdn.shopify.com/s/files/1/0431/9887/3763/files/sarabun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/zasukolut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/information_about_different_types_of_computer_viruses.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/b._u._m._s_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6928/files/prolactinoma_guidelines_2017.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_73209af57ff74388ad5a88db419724e4.pdf
    • https://static.usrfiles.com/ugd/9ea91e_9641061a8770435d988bbecee77a9534.pdf
    • https://static.usrfiles.com/ugd/1d64af_f80e5a90a3be4150bb7a2ea89bf9d7fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_356230d3c3694ca8af539d8cba9a1ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_48151c44e7f5418980e2c23affea03ec.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/kawedijemojelepukus.pdf
    • https://cdn.shopify.com/s/files/1/0440/0729/3086/files/22270688006.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/zoxudenakutimusuladedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2551/files/bereviwexirimovedawoj.pdf
    • https://cdn.shopify.com/s/files/1/0452/4739/8050/files/qualitative_approach_to_social_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/99274387001.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/zarorafelin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009813.bin
c07b67aad5aaf1e35c1dd7f6b6d92249bd0b81540cafa9e90f7b8c27938e66e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9813 5368 bytes
font_01_sfnt_off0000aa35.bin
35e1ec28c1b023ec5a8ecf94096c1b76c4dab55954319a8002b890bf9d6fd71f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA35 10596 bytes
font_02_sfnt_off0000ce91.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 4324 bytes