Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c3c76d9cc4ae7…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14a5450b2d3f8f76cf2110481ad8f9b2 SHA-1: 883ce62f0d38d139e10a26516bf67d539db5d70c SHA-256: c83c3c76d9cc4ae79552df727c93f0a7e6f5ac53ccf8fd388424a57fa078d474
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=personality+words+worksheets'. Additionally, it features a PDF link farm with numerous URLs hosted on Shopify and other domains, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to classify this as a malicious document.

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=personality+words+worksheets
    • http://files.tomboy-pretty.com/uploads/1/3/0/7/130775232/6006005.pdf
    • http://bodel.gamechefs.net/uploads/1/3/0/7/130738970/naxaleta_furokorukorov_sanoguf_mosejuful.pdf
    • http://waxaviwug.skylinemediacenter.org/uploads/1/3/0/7/130739059/40af2cb33baf8.pdf
    • http://rawik.millwoodcustomhomes.com/uploads/1/3/0/7/130776271/gulodenawive.pdf
    • http://tisufoxe.sjchurchglenwood.org/uploads/1/3/0/8/130874359/vasofipikusov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/tiresitoxulivoborodewidi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/halo_wars_2_decimus_guide.pdf
    • https://cdn.shopify.com/s/files/1/0445/6860/8927/files/nutritional_information_roasted_peanuts_in_shell.pdf
    • https://cdn.shopify.com/s/files/1/0440/2901/8262/files/fabevejatolefefukawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/lanexeguzawudilefawales.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/ripemukekaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/2015_grand_cherokee_srt8_performance_upgrades.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_off00005c95.bin
31874a3885d2222d51edcb1a4c57d3c45f0e89b67870d087d5b0a0d306bcaa3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 5172 bytes
font_01_sfnt_off00006e2d.bin
75835be0820e98417e1ce30a891fdb894c92857ac50a980eab0c0c9ee20c981e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2D 9980 bytes