Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9bbe0f715a41c7…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 05:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ee4877c88e2e11c957ae4b5c501959 SHA-1: 7534aeb548b42cdc8f507f07ef2fed6ece001b15 SHA-256: 3e9bbe0f715a41c768fb9ee27f42c51784b01e6236b682c5930ac3336379a696
152 Risk Score

Malware Insights

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

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 text related to 'gearing ratio analysis pdf' and the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=gearing%20ratio%20analysis%20pdf
    • http://files.luxesneakerboutique.com/uploads/1/3/0/7/130775853/gizuluveroji-rofinowaxuk-jejis-mokuzigavabi.pdf
    • http://zepokuzef.jenniferbelphotography.com/uploads/1/3/2/6/132681670/xulajeku.pdf
    • http://files.nhbdupage.com/uploads/1/3/0/8/130873893/4042896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0436/1430/6466/files/the_f_formula_marni.pdf
    • https://cdn.shopify.com/s/files/1/0434/9617/7816/files/dmv_va_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/bibinigizusud.pdf
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/21535987979.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/mobozufijoburo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/mokugezoruxesosagenasomas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/bewuroj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/vizamomupar.pdf
    • https://cdn.shopify.com/s/files/1/0437/3066/5637/files/22374320812.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/gibevoxipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/88627402433.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_off00005b14.bin
656594e1a321592e9b08560def1afec79caa3dc6dabe5704caaecb8b32635694
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B14 5340 bytes
font_01_sfnt_off00006d5d.bin
b5593bbc0623657bdb2faaea14c9613ae0d6c8b80069e8a069f2f755c971d94b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 14220 bytes