Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3cd16c7c20dad7…

MALICIOUS

PDF

40.5 KB Created: 2020-08-28 05:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f73668be602066b908fc9ac15f540772 SHA-1: 70142361dcec2cbdebb2da955994f2da3fd6dfe1 SHA-256: 9c3cd16c7c20dad7d63c22f825fbc65a2e8317e994960c1cf8caa0c928f42d52
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=easy+native+american+flute+sheet+music'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=easy+native+american+flute+sheet+music
    • http://files.standstrongcoalition.org/uploads/1/3/0/7/130738993/2213843.pdf
    • http://dunoge.morganestatesales.com/uploads/1/3/0/7/130775923/vaborowugoleros.pdf
    • http://doses.thecontemplativeacademy.com/uploads/1/3/2/8/132816202/januredivuxazal.pdf
    • http://files.keepyourcoal.com/uploads/1/3/1/8/131872105/bc7d5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/84780514440.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4629/files/libro_1000_bosquejos_para_predicadores.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/furosemide_stress_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/5543/9263/files/boyle_s_law_graph_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/change_username_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/berozowosabijako.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/90211241033.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/doduwakuresubowudiz.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_off00006100.bin
5b846e7313c345ab8aaef3a301af15cffbcbe2c62db846fd97df76315e156db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 5240 bytes
font_01_sfnt_off000072ad.bin
e655ee152455ac33bc49316fc338a415d098f7fde732112f537f950d91fc415a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AD 10060 bytes