Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb6e5e28df146bb…

MALICIOUS

PDF

37.7 KB Created: 2020-09-01 01:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1afda96bfce596c5df5ffa54331c92 SHA-1: ab66933a8c5ecc7be5b7b3d8599a4aa2fe6b90cd SHA-256: 9eb6e5e28df146bbd95ef648828e6dcaf1fe652de4138e0a522ce88350739d0b
152 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, includes text related to a school report, likely a lure. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO poisoning technique to distribute the malicious content. 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.com/pify?keyword=deeping+st+james+primary+school+ofsted+report
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/gokupogekiverijovopon.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/bafenorilixevanujeroderit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/strategic_planning_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5846/files/surat_al_kahfi_dan_artinya.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/fazutofezuzinupepoliv.pdf
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/2000_yamaha_v_star_1100.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/eustachian_tube_dysfunction_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0321/files/53766201710.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/91869508271.pdf
    • https://cdn.shopify.com/s/files/1/0432/6811/2550/files/how_to_open_inspect_element_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/tigituliwifoxakevapupijib.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_off00004833.bin
983fc3d05c77e619136d76122a2f43fc1eb611aee60b466a7e5bf4458cdf018b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4833 5532 bytes
font_01_sfnt_off00005ae2.bin
053baf4998e101ae3a6005bd606e9343eeffa0e30508c35d790030b1585fcb06
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE2 9748 bytes
font_02_sfnt_off00007c24.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 4324 bytes